The standard Ted2Go IDE is really good much better than the old Monk IDE from Monkey1. I was first annoyed that Jungle IDE didn’t follow into Monkey2 (I bought the lifetime license) but really Ted2Go covers most everything I used. Download Monkey2 and give it a spin!
In both cases (yours and the linked one) it’s Windows running on a Macbook. Is it a retina screen macbook? If yes, seems like windows doesn’t handle the hi dpi scaling well.
Have you tried on MacOS, since you’re on a Mac? Looks razor sharp here, the only minor problem is that sometimes when I uninstall and reinstall it the fonts look absolutely tiny, and you have to hit Window/Zoom In several times to go back to normal. Another benefit is that Monkey2 seems to compile much faster on MacOS, at least for me.
Maybe try out the different themes (window->themes). Going through them, I find a couple blurry, just assumed it is my bad eyes trying to focus on the different color combinations. Maybe it is just certain fonts can’t scale properly at certain resolutions.