Javascript slowdown on opening NTP

[atuchin-m]

Description

It was found that sometimes NTP javascript/React works extremely slow even on high-end hardware (MBP M1).
The trace analysis showed that the problem in JS code brave_new_tab.bundle.js.
Slack thread: https://bravesoftware.slack.com/archives/C3T9S9WKD/p1657652626908089

Steps to Reproduce

1. Launch the browser;
2. Open new tab page.

Actual result:

A significant delay: you see the grey page for more that 2 sec.

Expected result:

NTP is opened quickly.

Reproduces how often:

Unstable, only few people can reproduce.

Brave version (brave://version info)

1.42.x beta, 1.43.x nightly

Miscellaneous Information:

There is a video here: https://bravesoftware.slack.com/archives/C3T9S9WKD/p1657746370715679?thread_ts=1657652626.908089&cid=C3T9S9WKD

[atuchin-m]

I've found that it's primary the result of using x64 version of M1. Rosseta performance is unpredictable and there is no sense to use x64 instead of arm64 on m1.