Yesterday I decided to do an online firmware update to 1.3.6 Build 20200902 rel.65591(4555). After updating there has been a significant performance drop which is unbearable. Since support has answered none of my attempts so far to contact them I'm reaching out to the community. Is there any beta build that would fix my issue or any way to revert to the exact previous firmware build I was on?

Edit #1: The problem seems to be atleast somewhat similar to the one described in 

https://community.tp-link.com/en/home/forum/topic/205484?page=1 

2.4GHz seems ok but 5GHz doesn't work as expected on my desktop, as in the linked thread

Edit #2: Reinstalling the drivers of my pc's wireless adapter seemed to fix the issue for about 15 minutes but now we are back to what I explained above.