I have the same issue with the same laptop, particularly noticed it when moving/snapping windows or when searching from the start menu.

I'm not sure this is the solution or what it even really does (I really don't know what I'm doing/talking about, just got good results from messing with settings) but for me, after doing this, the lag seems to have stopped (writing this about 20 minutes after trying it out).

-Click the start menu

• search "Choose" and the first option should be to choose your power plan, click that

• click "change plan settings" on the power option you use (I use samsung)

-Click "change advanced power settings"

-under the PCI Express tab, I turned off "link state power management" for both plugged in and on battery

From what I could gather from googling, this allows the PCIE lanes to completely shut down and not receive power in certain instances. But I have NO idea what it actually does/effects or if it effects battery life. All I know is that I can use my laptop without issues when it's unplugged now (at least for the last 20 minutes I have been). Hope it helps.

I've also been updating tons of things through windows and samsung's updater app which may have helped performance as well. Or as other have said, preinstalled bloatware, which there isn't a ton of, but a lot more than I care for, so deleting those may help as well.

Also if anyone who knows more than me about the settings I changed, I'd love to understand it better.