fix: improve assets perfs + fix blurred balances and prices (#12843)

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## **Description**

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Write a short description of the changes included in this pull request,
also include relevant motivation and context. Have in mind the following
questions:
1. What is the reason for the change?
2. What is the improvement/solution?
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## **Related issues**

Fixes:  #12724

## **Manual testing steps**

1. Build android project locally
2. Add your account or create new one
3. switch btw network ( the perfs should be good )
4. switch btw popular network and current network on the token list and
check the perfs
5. the list of assets should be displayed quickly

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

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### **After**

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https://github.com/user-attachments/assets/cdd70d65-820b-40fc-ba7f-85a6dceb66c1


## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

app/components/UI/Tokens/TokenList/PortfolioBalance/index.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { useMemo, useCallback } from 'react';
 import { View, TouchableOpacity } from 'react-native';
 import { useNavigation } from '@react-navigation/native';
 import { useSelector } from 'react-redux';
@@ -56,7 +56,7 @@ import { InternalAccount } from '@metamask/keyring-internal-api';
 import { getChainIdsToPoll } from '../../../../../selectors/tokensController';
 import AggregatedPercentageCrossChains from '../../../../../component-library/components-temp/Price/AggregatedPercentage/AggregatedPercentageCrossChains';
 
-export const PortfolioBalance = () => {
+export const PortfolioBalance = React.memo(() => {
   const { PreferencesController } = Engine.context;
   const { colors } = useTheme();
   const styles = createStyles(colors);
@@ -112,24 +112,24 @@ export const PortfolioBalance = () => {
     type,
   );
 
-  let total;
-  if (isOriginalNativeTokenSymbol) {
-    if (isPortfolioViewEnabled()) {
-      total = totalFiatBalance ?? 0;
-    } else {
+  const total = useMemo(() => {
+    if (isOriginalNativeTokenSymbol) {
+      if (isPortfolioViewEnabled()) {
+        return totalFiatBalance ?? 0;
+      }
       const tokenFiatTotal = balance?.tokenFiat ?? 0;
       const ethFiatTotal = balance?.ethFiat ?? 0;
-      total = tokenFiatTotal + ethFiatTotal;
+      return tokenFiatTotal + ethFiatTotal;
+    }
+    if (isPortfolioViewEnabled()) {
+      return totalTokenFiat ?? 0;
     }
-  } else if (isPortfolioViewEnabled()) {
-    total = totalTokenFiat ?? 0;
-  } else {
-    total = balance?.tokenFiat ?? 0;
-  }
+    return balance?.tokenFiat ?? 0;
+  }, [isOriginalNativeTokenSymbol, totalFiatBalance, totalTokenFiat, balance]);
 
   const fiatBalance = `${renderFiat(total, currentCurrency)}`;
 
-  const onOpenPortfolio = () => {
+  const onOpenPortfolio = useCallback(() => {
     const existingPortfolioTab = browserTabs.find(({ url }: BrowserTab) =>
       isPortfolioUrl(url),
     );
@@ -172,7 +172,14 @@ export const PortfolioBalance = () => {
         })
         .build(),
     );
-  };
+  }, [
+    navigation,
+    trackEvent,
+    createEventBuilder,
+    isEnabled,
+    isDataCollectionForMarketingEnabled,
+    browserTabs,
+  ]);
 
   const renderAggregatedPercentage = () => {
     if (isTestNet(chainId)) {
@@ -199,9 +206,12 @@ export const PortfolioBalance = () => {
     );
   };
 
-  const toggleIsBalanceAndAssetsHidden = (value: boolean) => {
-    PreferencesController.setPrivacyMode(value);
-  };
+  const toggleIsBalanceAndAssetsHidden = useCallback(
+    (value: boolean) => {
+      PreferencesController.setPrivacyMode(value);
+    },
+    [PreferencesController],
+  );
 
   return (
     <View style={styles.portfolioBalance}>
@@ -247,4 +257,4 @@ export const PortfolioBalance = () => {
       </View>
     </View>
   );
-};
+});