In addition to what I had stated in the discussion that Peru Bob linked to, your GeForce 820m is now completely obsolete. It is not of a newer GPU architecture at all - but is actually of the Fermi Refresh architecture (aka the GeForce 500 series) from way back in 2011. As such, all support for all Fermi GPUs - both desktop and mobile - had ended completely way back in March 2018. Driver version 391.35 - the very last driver version that was compatible at all with your discrete GPU - was released near the end of March 2018. And although Fermi technically continued in "legacy" support status until January of 2019, no new driver updates - not even security patches - had been released since then.
As a result, your laptop is now officially obsolete. The only fix, unfortunately, is a completely new laptop.
One of the ongoing issues with Premiere Pro for the last few years has been linked between stability and performance. Current management brought in a head honcho to go after that a bit over a year ago, and they've rebuilt their entire process to better get at such things.
One of the parts: they have to have specific code for every type of hardware the app could be used on. So every effect, every function, has a ton of iterative bits for different hardware. This adds a massive amount to the file size of the app, and to the logic process for the computer running the app on any X gear.
Cutting down on the complexity ... the 'extra' chunks of code ... for older gear was part of the needed steps to getting both performance and stability while gutting and updating the entire program over time.
So to keep the app "crisp", old code had to go. So it isn't that say Adobe is out to mangle anyone, they're trying to keep the product worthwhile. And the gear makers naturally make their living off their new gear. Like the 2080Ti in my new beast from Puget that's supposed to arrive tomorrow ... two days after the 3090 new monster card was trotted out by Nvidia.
That 2080Ti screams through Neat noise reduction compared to my current 1060. Yea, I'm eager to get this new beast. I'll be going from 6-core/12-threads at 3.2Ghz, 32GB RAM, and a GTX1060 to 24 cores, 128GB./RAM, and a 2080Ti all at significantly higher clock rates. The benchmark numbers they tested for my new rig have me drooling.
My "old" desktop is then going to my wife's workstation, as she does pro still portraiture. It's a significant upgrade for her. And it's a dance we do about every three years. Sigh. Have for over 30.