For the problems you encountered: the refresh rate can be set in the monitor settings. If you can’t go any higher, then there might be a problem with your graphics drivers. It is also important to add that Pop!OS is based on Ubuntu, which can take ages to implement modern changes. For Gaming I would generally recommend a rolling release distro, maybe it be OpenSUSE Tumbleweed, Fedora, etc… Otherwise you might not get the cutting edge tech that you need.
As for Tetr.io: it seems to be a problem with Vulcan, namely that improperly configured drivers will use the iGPU by default. How do you install/run that game?
For the problems you encountered: the refresh rate can be set in the monitor settings. If you can’t go any higher, then there might be a problem with your graphics drivers. It is also important to add that Pop!OS is based on Ubuntu, which can take ages to implement modern changes. For Gaming I would generally recommend a rolling release distro, maybe it be OpenSUSE Tumbleweed, Fedora, etc… Otherwise you might not get the cutting edge tech that you need.
As for Tetr.io: it seems to be a problem with Vulcan, namely that improperly configured drivers will use the iGPU by default. How do you install/run that game?