In general, the UI renders blurry on my 35" Ultrawide monitor. Especially if I move the window. In this side by side screen capture, you can easily see the difference in how they are rendered in the web and desktop (left) and web (right) interfaces. Same file same zoom level (100%):
In addition, the instructions for scaling up the UI are pretty much for Mac only and should be updated to include better instructions and screenshots for Windows Users too. However, they will make UI elements larger but they are still softer and harder to read in general.