diff --git a/functions/src/scripts/backfill-unique-bettors.ts b/functions/src/scripts/backfill-unique-bettors.ts
new file mode 100644
index 00000000..35faa54a
--- /dev/null
+++ b/functions/src/scripts/backfill-unique-bettors.ts
@@ -0,0 +1,39 @@
+import * as admin from 'firebase-admin'
+import { initAdmin } from './script-init'
+import { getValues, log, writeAsync } from '../utils'
+import { Bet } from '../../../common/bet'
+import { groupBy, mapValues, sortBy, uniq } from 'lodash'
+
+initAdmin()
+const firestore = admin.firestore()
+
+const getBettorsByContractId = async () => {
+  const bets = await getValues<Bet>(firestore.collectionGroup('bets'))
+  log(`Loaded ${bets.length} bets.`)
+  const betsByContractId = groupBy(bets, 'contractId')
+  return mapValues(betsByContractId, (bets) =>
+    uniq(sortBy(bets, 'createdTime').map((bet) => bet.userId))
+  )
+}
+
+const updateUniqueBettors = async () => {
+  const bettorsByContractId = await getBettorsByContractId()
+
+  const updates = Object.entries(bettorsByContractId).map(
+    ([contractId, userIds]) => {
+      const update = {
+        uniqueBettorIds: userIds,
+        uniqueBettorCount: userIds.length,
+      }
+      const docRef = firestore.collection('contracts').doc(contractId)
+      return { doc: docRef, fields: update }
+    }
+  )
+  log(`Updating ${updates.length} contracts.`)
+  await writeAsync(firestore, updates)
+  log(`Updated all contracts.`)
+}
+
+if (require.main === module) {
+  updateUniqueBettors()
+}
diff --git a/web/components/bets-list.tsx b/web/components/bets-list.tsx
index 4ac873b4..3270408b 100644
--- a/web/components/bets-list.tsx
+++ b/web/components/bets-list.tsx
@@ -1,14 +1,5 @@
 import Link from 'next/link'
-import {
-  Dictionary,
-  keyBy,
-  groupBy,
-  mapValues,
-  sortBy,
-  partition,
-  sumBy,
-  uniq,
-} from 'lodash'
+import { keyBy, groupBy, mapValues, sortBy, partition, sumBy } from 'lodash'
 import dayjs from 'dayjs'
 import { useEffect, useMemo, useState } from 'react'
 import clsx from 'clsx'
@@ -28,7 +19,6 @@ import {
   Contract,
   contractPath,
   getBinaryProbPercent,
-  getContractFromId,
 } from 'web/lib/firebase/contracts'
 import { Row } from './layout/row'
 import { UserLink } from './user-page'
@@ -56,9 +46,9 @@ import { SellSharesModal } from './sell-modal'
 import { useUnfilledBets } from 'web/hooks/use-bets'
 import { LimitBet } from 'common/bet'
 import { floatingEqual } from 'common/util/math'
-import { filterDefined } from 'common/util/array'
 import { Pagination } from './pagination'
 import { LimitOrderTable } from './limit-bets'
+import { useUserBetContracts } from 'web/hooks/use-contracts'
 
 type BetSort = 'newest' | 'profit' | 'closeTime' | 'value'
 type BetFilter = 'open' | 'limit_bet' | 'sold' | 'closed' | 'resolved' | 'all'
@@ -72,26 +62,22 @@ export function BetsList(props: { user: User }) {
   const signedInUser = useUser()
   const isYourBets = user.id === signedInUser?.id
   const hideBetsBefore = isYourBets ? 0 : JUNE_1_2022
-  const userBets = useUserBets(user.id, { includeRedemptions: true })
-  const [contractsById, setContractsById] = useState<
-    Dictionary<Contract> | undefined
-  >()
+  const userBets = useUserBets(user.id)
 
   // Hide bets before 06-01-2022 if this isn't your own profile
   // NOTE: This means public profits also begin on 06-01-2022 as well.
   const bets = useMemo(
-    () => userBets?.filter((bet) => bet.createdTime >= (hideBetsBefore ?? 0)),
+    () =>
+      userBets?.filter(
+        (bet) => !bet.isAnte && bet.createdTime >= (hideBetsBefore ?? 0)
+      ),
     [userBets, hideBetsBefore]
   )
 
-  useEffect(() => {
-    if (bets) {
-      const contractIds = uniq(bets.map((b) => b.contractId))
-      Promise.all(contractIds.map(getContractFromId)).then((contracts) => {
-        setContractsById(keyBy(filterDefined(contracts), 'id'))
-      })
-    }
-  }, [bets])
+  const contractList = useUserBetContracts(user.id)
+  const contractsById = useMemo(() => {
+    return contractList ? keyBy(contractList, 'id') : undefined
+  }, [contractList])
 
   const [sort, setSort] = useState<BetSort>('newest')
   const [filter, setFilter] = useState<BetFilter>('open')
diff --git a/web/components/nav/sidebar.tsx b/web/components/nav/sidebar.tsx
index f40cd80e..3e1ecb83 100644
--- a/web/components/nav/sidebar.tsx
+++ b/web/components/nav/sidebar.tsx
@@ -319,7 +319,7 @@ function GroupsList(props: { currentPage: string; memberItems: Item[] }) {
         {memberItems.map((item) => (
           <a
             href={item.href}
-            key={item.name}
+            key={item.href}
             onClick={trackCallback('click sidebar group', { name: item.name })}
             className={clsx(
               'cursor-pointer truncate',
diff --git a/web/components/portfolio/portfolio-value-section.tsx b/web/components/portfolio/portfolio-value-section.tsx
index 706630b2..ab4bef0c 100644
--- a/web/components/portfolio/portfolio-value-section.tsx
+++ b/web/components/portfolio/portfolio-value-section.tsx
@@ -1,43 +1,26 @@
-import { PortfolioMetrics } from 'common/user'
 import { formatMoney } from 'common/util/format'
 import { last } from 'lodash'
-import { memo, useEffect, useState } from 'react'
-import { Period, getPortfolioHistory } from 'web/lib/firebase/users'
+import { memo, useRef, useState } from 'react'
+import { usePortfolioHistory } from 'web/hooks/use-portfolio-history'
+import { Period } from 'web/lib/firebase/users'
 import { Col } from '../layout/col'
 import { Row } from '../layout/row'
 import { PortfolioValueGraph } from './portfolio-value-graph'
-import { DAY_MS } from 'common/util/time'
-
-const periodToCutoff = (now: number, period: Period) => {
-  switch (period) {
-    case 'daily':
-      return now - 1 * DAY_MS
-    case 'weekly':
-      return now - 7 * DAY_MS
-    case 'monthly':
-      return now - 30 * DAY_MS
-    case 'allTime':
-    default:
-      return new Date(0)
-  }
-}
 
 export const PortfolioValueSection = memo(
   function PortfolioValueSection(props: { userId: string }) {
     const { userId } = props
 
     const [portfolioPeriod, setPortfolioPeriod] = useState<Period>('weekly')
-    const [portfolioHistory, setUsersPortfolioHistory] = useState<
-      PortfolioMetrics[]
-    >([])
+    const portfolioHistory = usePortfolioHistory(userId, portfolioPeriod)
 
-    useEffect(() => {
-      const cutoff = periodToCutoff(Date.now(), portfolioPeriod).valueOf()
-      getPortfolioHistory(userId, cutoff).then(setUsersPortfolioHistory)
-    }, [portfolioPeriod, userId])
+    // Remember the last defined portfolio history.
+    const portfolioRef = useRef(portfolioHistory)
+    if (portfolioHistory) portfolioRef.current = portfolioHistory
+    const currPortfolioHistory = portfolioRef.current
 
-    const lastPortfolioMetrics = last(portfolioHistory)
-    if (portfolioHistory.length === 0 || !lastPortfolioMetrics) {
+    const lastPortfolioMetrics = last(currPortfolioHistory)
+    if (!currPortfolioHistory || !lastPortfolioMetrics) {
       return <></>
     }
 
@@ -64,7 +47,7 @@ export const PortfolioValueSection = memo(
           </select>
         </Row>
         <PortfolioValueGraph
-          portfolioHistory={portfolioHistory}
+          portfolioHistory={currPortfolioHistory}
           includeTime={portfolioPeriod == 'daily'}
         />
       </>
diff --git a/web/hooks/use-contracts.ts b/web/hooks/use-contracts.ts
index efe30d38..f277a209 100644
--- a/web/hooks/use-contracts.ts
+++ b/web/hooks/use-contracts.ts
@@ -1,3 +1,4 @@
+import { useFirestoreQueryData } from '@react-query-firebase/firestore'
 import { isEqual } from 'lodash'
 import { useEffect, useRef, useState } from 'react'
 import {
@@ -8,6 +9,7 @@ import {
   listenForHotContracts,
   listenForInactiveContracts,
   listenForNewContracts,
+  getUserBetContractsQuery,
 } from 'web/lib/firebase/contracts'
 
 export const useContracts = () => {
@@ -89,3 +91,15 @@ export const useUpdatedContracts = (contracts: Contract[] | undefined) => {
     ? contracts.map((c) => contractDict.current[c.id])
     : undefined
 }
+
+export const useUserBetContracts = (userId: string) => {
+  const result = useFirestoreQueryData(
+    ['contracts', 'bets', userId],
+    getUserBetContractsQuery(userId),
+    { subscribe: true, includeMetadataChanges: true },
+    // Temporary workaround for react-query bug:
+    // https://github.com/invertase/react-query-firebase/issues/25
+    { refetchOnMount: 'always' }
+  )
+  return result.data
+}
diff --git a/web/hooks/use-notifications.ts b/web/hooks/use-notifications.ts
index d02d3d30..b2f1701f 100644
--- a/web/hooks/use-notifications.ts
+++ b/web/hooks/use-notifications.ts
@@ -20,8 +20,9 @@ function useNotifications(privateUser: PrivateUser) {
     { subscribe: true, includeMetadataChanges: true },
     // Temporary workaround for react-query bug:
     // https://github.com/invertase/react-query-firebase/issues/25
-    { cacheTime: 0 }
+    { refetchOnMount: 'always' }
   )
+
   const notifications = useMemo(() => {
     if (!result.data) return undefined
     const notifications = result.data as Notification[]
diff --git a/web/hooks/use-portfolio-history.ts b/web/hooks/use-portfolio-history.ts
new file mode 100644
index 00000000..d5919783
--- /dev/null
+++ b/web/hooks/use-portfolio-history.ts
@@ -0,0 +1,32 @@
+import { useFirestoreQueryData } from '@react-query-firebase/firestore'
+import { DAY_MS, HOUR_MS } from 'common/util/time'
+import { getPortfolioHistoryQuery, Period } from 'web/lib/firebase/users'
+
+export const usePortfolioHistory = (userId: string, period: Period) => {
+  const nowRounded = Math.round(Date.now() / HOUR_MS) * HOUR_MS
+  const cutoff = periodToCutoff(nowRounded, period).valueOf()
+
+  const result = useFirestoreQueryData(
+    ['portfolio-history', userId, cutoff],
+    getPortfolioHistoryQuery(userId, cutoff),
+    { subscribe: true, includeMetadataChanges: true },
+    // Temporary workaround for react-query bug:
+    // https://github.com/invertase/react-query-firebase/issues/25
+    { refetchOnMount: 'always' }
+  )
+  return result.data
+}
+
+const periodToCutoff = (now: number, period: Period) => {
+  switch (period) {
+    case 'daily':
+      return now - 1 * DAY_MS
+    case 'weekly':
+      return now - 7 * DAY_MS
+    case 'monthly':
+      return now - 30 * DAY_MS
+    case 'allTime':
+    default:
+      return new Date(0)
+  }
+}
diff --git a/web/hooks/use-prefetch.ts b/web/hooks/use-prefetch.ts
new file mode 100644
index 00000000..e22e13eb
--- /dev/null
+++ b/web/hooks/use-prefetch.ts
@@ -0,0 +1,11 @@
+import { useUserBetContracts } from './use-contracts'
+import { usePortfolioHistory } from './use-portfolio-history'
+import { useUserBets } from './use-user-bets'
+
+export function usePrefetch(userId: string | undefined) {
+  const maybeUserId = userId ?? ''
+
+  useUserBets(maybeUserId)
+  useUserBetContracts(maybeUserId)
+  usePortfolioHistory(maybeUserId, 'weekly')
+}
diff --git a/web/hooks/use-user-bets.ts b/web/hooks/use-user-bets.ts
index b260a406..72a4e5bf 100644
--- a/web/hooks/use-user-bets.ts
+++ b/web/hooks/use-user-bets.ts
@@ -1,22 +1,21 @@
-import { uniq } from 'lodash'
+import { useFirestoreQueryData } from '@react-query-firebase/firestore'
 import { useEffect, useState } from 'react'
 import {
   Bet,
-  listenForUserBets,
+  getUserBetsQuery,
   listenForUserContractBets,
 } from 'web/lib/firebase/bets'
 
-export const useUserBets = (
-  userId: string | undefined,
-  options: { includeRedemptions: boolean }
-) => {
-  const [bets, setBets] = useState<Bet[] | undefined>(undefined)
-
-  useEffect(() => {
-    if (userId) return listenForUserBets(userId, setBets, options)
-  }, [userId])
-
-  return bets
+export const useUserBets = (userId: string) => {
+  const result = useFirestoreQueryData(
+    ['bets', userId],
+    getUserBetsQuery(userId),
+    { subscribe: true, includeMetadataChanges: true },
+    // Temporary workaround for react-query bug:
+    // https://github.com/invertase/react-query-firebase/issues/25
+    { refetchOnMount: 'always' }
+  )
+  return result.data
 }
 
 export const useUserContractBets = (
@@ -33,36 +32,6 @@ export const useUserContractBets = (
   return bets
 }
 
-export const useUserBetContracts = (
-  userId: string | undefined,
-  options: { includeRedemptions: boolean }
-) => {
-  const [contractIds, setContractIds] = useState<string[] | undefined>()
-
-  useEffect(() => {
-    if (userId) {
-      const key = `user-bet-contractIds-${userId}`
-
-      const userBetContractJson = localStorage.getItem(key)
-      if (userBetContractJson) {
-        setContractIds(JSON.parse(userBetContractJson))
-      }
-
-      return listenForUserBets(
-        userId,
-        (bets) => {
-          const contractIds = uniq(bets.map((bet) => bet.contractId))
-          setContractIds(contractIds)
-          localStorage.setItem(key, JSON.stringify(contractIds))
-        },
-        options
-      )
-    }
-  }, [userId])
-
-  return contractIds
-}
-
 export const useGetUserBetContractIds = (userId: string | undefined) => {
   const [contractIds, setContractIds] = useState<string[] | undefined>()
 
diff --git a/web/lib/firebase/bets.ts b/web/lib/firebase/bets.ts
index ef0ab55d..2a095d32 100644
--- a/web/lib/firebase/bets.ts
+++ b/web/lib/firebase/bets.ts
@@ -11,6 +11,7 @@ import {
   getDocs,
   getDoc,
   DocumentSnapshot,
+  Query,
 } from 'firebase/firestore'
 import { uniq } from 'lodash'
 
@@ -131,24 +132,12 @@ export async function getContractsOfUserBets(userId: string) {
   return filterDefined(contracts)
 }
 
-export function listenForUserBets(
-  userId: string,
-  setBets: (bets: Bet[]) => void,
-  options: { includeRedemptions: boolean }
-) {
-  const { includeRedemptions } = options
-  const userQuery = query(
+export function getUserBetsQuery(userId: string) {
+  return query(
     collectionGroup(db, 'bets'),
     where('userId', '==', userId),
     orderBy('createdTime', 'desc')
-  )
-  return listenForValues<Bet>(userQuery, (bets) => {
-    setBets(
-      bets.filter(
-        (bet) => (includeRedemptions || !bet.isRedemption) && !bet.isAnte
-      )
-    )
-  })
+  ) as Query<Bet>
 }
 
 export function listenForUserContractBets(
diff --git a/web/lib/firebase/contracts.ts b/web/lib/firebase/contracts.ts
index d3f18f54..2751e9bb 100644
--- a/web/lib/firebase/contracts.ts
+++ b/web/lib/firebase/contracts.ts
@@ -6,6 +6,7 @@ import {
   getDocs,
   limit,
   orderBy,
+  Query,
   query,
   setDoc,
   startAfter,
@@ -156,6 +157,13 @@ export function listenForUserContracts(
   return listenForValues<Contract>(q, setContracts)
 }
 
+export function getUserBetContractsQuery(userId: string) {
+  return query(
+    contracts,
+    where('uniqueBettorIds', 'array-contains', userId)
+  ) as Query<Contract>
+}
+
 const activeContractsQuery = query(
   contracts,
   where('isResolved', '==', false),
diff --git a/web/lib/firebase/users.ts b/web/lib/firebase/users.ts
index bad13c8c..c0764f0a 100644
--- a/web/lib/firebase/users.ts
+++ b/web/lib/firebase/users.ts
@@ -12,6 +12,7 @@ import {
   deleteDoc,
   collectionGroup,
   onSnapshot,
+  Query,
 } from 'firebase/firestore'
 import { getAuth } from 'firebase/auth'
 import { GoogleAuthProvider, signInWithPopup } from 'firebase/auth'
@@ -252,15 +253,13 @@ export async function unfollow(userId: string, unfollowedUserId: string) {
   await deleteDoc(followDoc)
 }
 
-export async function getPortfolioHistory(userId: string, since: number) {
-  return getValues<PortfolioMetrics>(
-    query(
-      collectionGroup(db, 'portfolioHistory'),
-      where('userId', '==', userId),
-      where('timestamp', '>=', since),
-      orderBy('timestamp', 'asc')
-    )
-  )
+export function getPortfolioHistoryQuery(userId: string, since: number) {
+  return query(
+    collectionGroup(db, 'portfolioHistory'),
+    where('userId', '==', userId),
+    where('timestamp', '>=', since),
+    orderBy('timestamp', 'asc')
+  ) as Query<PortfolioMetrics>
 }
 
 export function listenForFollows(
diff --git a/web/pages/[username]/[contractSlug].tsx b/web/pages/[username]/[contractSlug].tsx
index 3667511e..2ef472fc 100644
--- a/web/pages/[username]/[contractSlug].tsx
+++ b/web/pages/[username]/[contractSlug].tsx
@@ -42,6 +42,7 @@ import {
 } from 'web/components/contract/contract-leaderboard'
 import { ContractsGrid } from 'web/components/contract/contracts-grid'
 import { Title } from 'web/components/title'
+import { usePrefetch } from 'web/hooks/use-prefetch'
 
 export const getStaticProps = fromPropz(getStaticPropz)
 export async function getStaticPropz(props: {
@@ -157,6 +158,7 @@ export function ContractPageContent(
   const { backToHome, comments, user } = props
 
   const contract = useContractWithPreload(props.contract) ?? props.contract
+  usePrefetch(user?.id)
 
   useTracking('view market', {
     slug: contract.slug,
diff --git a/web/pages/home.tsx b/web/pages/home.tsx
index 265fd79a..5b6c445c 100644
--- a/web/pages/home.tsx
+++ b/web/pages/home.tsx
@@ -15,6 +15,7 @@ import { track } from 'web/lib/service/analytics'
 import { authenticateOnServer } from 'web/lib/firebase/server-auth'
 import { useSaveReferral } from 'web/hooks/use-save-referral'
 import { GetServerSideProps } from 'next'
+import { usePrefetch } from 'web/hooks/use-prefetch'
 
 export const getServerSideProps: GetServerSideProps = async (ctx) => {
   const creds = await authenticateOnServer(ctx)
@@ -30,6 +31,7 @@ const Home = (props: { auth: { user: User } | null }) => {
   useTracking('view home')
 
   useSaveReferral()
+  usePrefetch(user?.id)
 
   return (
     <>