Fix the bug of slow emoji rendering on mac chrome

packages/emoji-mart/src/components/Picker/Picker.tsx

@@ -3,7 +3,7 @@ import { Component, createRef } from 'preact'
 
 import { deepEqual, sleep, getEmojiData } from '../../utils'
 import { Data, I18n, init } from '../../config'
-import { SearchIndex, Store, FrequentlyUsed } from '../../helpers'
+import { SearchIndex, Store, FrequentlyUsed, UserAgent } from '../../helpers'
 import Icons from '../../icons'
 
 import { Emoji } from '../Emoji'
@@ -776,6 +776,12 @@ export default class Picker extends Component {
             height: this.props.emojiButtonSize,
             fontSize: this.props.emojiSize,
             lineHeight: 0,
+            backfaceVisibility:
+              UserAgent.isMacOs &&
+              UserAgent.chromeVersion > 0 &&
+              UserAgent.chromeVersion < 121
+                ? 'hidden'
+                : undefined,
           }}
         >
           <div

packages/emoji-mart/src/helpers/index.ts

@@ -3,6 +3,7 @@ export { default as Store } from './store'
 export { default as NativeSupport } from './native-support'
 export { default as FrequentlyUsed } from './frequently-used'
 export { default as SearchIndex } from './search-index'
+export { default as UserAgent } from './user-agent'
 
 export const SafeFlags = [
   'checkered_flag',

packages/emoji-mart/src/helpers/user-agent.ts

@@ -0,0 +1,13 @@
+const agent: string = window.navigator.userAgent.toLowerCase()
+
+const isMacOs: boolean = agent.indexOf('mac') !== -1
+const isChrome: boolean = agent.indexOf('chrome') > -1
+const chromeVersion: number = isChrome
+  ? parseInt(agent.match(/chrome\/(\d+)/i)[1])
+  : 0
+
+export default {
+  isMacOs,
+  isChrome,
+  chromeVersion,
+}