I reached to the best temporarily solution so far!
My lap specs:
CPU: core i5 11300h
GPU: rtx 3050ti 4GB
Ram: 24GB
Windows 11
Set Windows display resolution to 1600x900
In-game settings:
Display settings:
Resolution 1600x900
Refresh rate: ur Monitor refresh rate
Frame rate: 60FPS
Vsync: on
And the rest off/default
Graphic settings:
All settings on low/off, except grass on medium, as my preference. Or all settings low/off.
U won't get that massive frame drop after first half which now u can complete matches, however, the drop gonna still occur after the match end(which is fine), when u quit an online match or sometimes when u open a pack, what u do in those cases is that instead of restart the game, just exit UT and u will see ur frame rate back to normal as soon as the game loading to the game main menu. just go back to UT and that's it. U can play again with no issues. It's still an issue and they should fix it. But at least u can finish matches and u don't need to restart the game