[2020] NVidia, framerate lags after patch?

Yesterday the gameplay seemed fine and smooth. However, after today's patch, there are lags almost every time I play something, and at times when my opponent makes a play as well.

I have already encountered such situations on two or three occasions, so I performed a clean install (with Display Driver Uninstaller), installed latest drivers, checked that MTGA uses the NVidia GPU in the NVidia Control Panel (I also have an integrated GPU on my laptop). Yet after all that, the problem seems to persist. It is much less enjoyable to play now.

My laptop was able to run MTGA very smoothly so it's not about the weak GPU (GTX 960 M), CPU (Intel i7) or whatever.