Recently some Chrome OS users reported when using their devices in tablet mode
Thankfully, Google appears to be working on a fix. a recent bug tracker has revealed that Google plans to fix Chrome OS tablet mode multitasking screen layer. Based on the tracker, it seems that the poor frame rates can be attributed to how Chrome OS renders the screened rounded corners.
"A lot of animation seems to be coming from the use of Mask Layers to create rounded corners. This combined with background blur adds a lot of additional steps in the paint / rendering pipeline, ”reads a message in the tracker.
“ The performance (fps increase) and memory improvement (tiles [don’t] get discarded and we actually see the content) is quite significant on Nocturne Celeron when rounded corners are removed. "For example, the tracker notes that remove the corners on the Pixel Slate resulted in a" significant "improvement in performance.
It's unclear when Google will roll out a fix, however.