[🐴] Minor nits (#4102)

* set a better size for `initialNumToRender`

* memo list items

* scroll to end on both platforms

* rev

src/screens/Messages/List/ChatListItem.tsx

@@ -25,12 +25,17 @@ import {Bell2Off_Filled_Corner0_Rounded as BellStroke} from '#/components/icons/
 import {useMenuControl} from '#/components/Menu'
 import {Text} from '#/components/Typography'
 
-export function ChatListItem({convo}: {convo: ChatBskyConvoDefs.ConvoView}) {
+export let ChatListItem = ({
+  convo,
+}: {
+  convo: ChatBskyConvoDefs.ConvoView
+}): React.ReactNode => {
   const {currentAccount} = useSession()
+  const moderationOpts = useModerationOpts()
+
   const otherUser = convo.members.find(
     member => member.did !== currentAccount?.did,
   )
-  const moderationOpts = useModerationOpts()
 
   if (!otherUser || !moderationOpts) {
     return null
@@ -45,6 +50,8 @@ export function ChatListItem({convo}: {convo: ChatBskyConvoDefs.ConvoView}) {
   )
 }
 
+ChatListItem = React.memo(ChatListItem)
+
 function ChatListItemReady({
   convo,
   profile: profileUnshadowed,

src/screens/Messages/List/index.tsx

@@ -73,7 +73,7 @@ export function MessagesScreen({navigation, route}: Props) {
     )
   }, [_, t])
 
-  const initialNumToRender = useInitialNumToRender()
+  const initialNumToRender = useInitialNumToRender(80)
   const [isPTRing, setIsPTRing] = useState(false)
 
   const {