[HOLD for Payment 2024-07-22] [$250] Improve ReportScreen rendering time

[mountiny]

Problem

The Profiler indicates that the ReportScreen render time gets re-rendered dozens of times, with each re-rendering taking an average of 599.8ms.

The most current problems are with this hook:

const lastAccessedReportID = useLastAccessedReportID(!!route.params.openOnAdminRoom);

In this PR we’ve introduced the above hook and there might be several problems with it:

1. We are calculating lastAccessedReportID in each re-render, however, we only require it in one particular scenario: when the route.params.reportID is empty,
2. The useLastAccessedReportID hook is heavy, due to the poor performance of the ReportUtils.findLastAccessedReport function. This issue existed before the introduction of the PR mentioned.

Solution

Ad 1.
We should calculate the lastAccessedReportID only when needed, that means only once, and only when route.params.reportID is empty (code). This value is used to determine which chat we should show to the user when the user accesses the website without reportID in the URL. POC

Ad 2.
After diving deep into the code I’ve discovered that we sort a whole array of reports just to get one, the most recent, report. We can replace this sort with lodashMaxBy, as we do not (from my analysis) need to sort all reports (needs confirmation). POC

cc @kosmydel

Upwork Automation - Do Not Edit

• Upwork Job URL: https://www.upwork.com/jobs/~0109e0b5642eb1863c
• Upwork Job ID: 1809262837407973619
• Last Price Increase: 2024-07-05
• Automatic offers:
• ikevin127 | Reviewer | 103028165

Issue Owner

Current Issue Owner: @zanyrenney

[melvin-bot]

Current assignee @mountiny is eligible for the AutoAssignerNewDotQuality assigner, not assigning anyone new.

[melvin-bot]

Triggered auto assignment to @zanyrenney (Bug), see https://stackoverflow.com/c/expensify/questions/14418 for more details. Please add this bug to a GH project, as outlined in the SO.

[melvin-bot]

Job added to Upwork: https://www.upwork.com/jobs/~0109e0b5642eb1863c

[melvin-bot]

Triggered auto assignment to Contributor-plus team member for initial proposal review - @ikevin127 (External)