I didn't know about UltraEdit - just tested on my files that I work with: 50MiB of ASM.js code in ~20 lines.

UltraEdit is very sluggish - to the moment it's not usable to work with.

I did a very subjective comparison between few editors in terms of speed in working with such file (flow is: open, find, manually edit, save). And in my eyes here is the result: 1. Cuda Text 2. Sublime 4 3. VS Code 6. UltraEdit

Please note: I only tested the workflow that I work on daily basis. I can see that UltraEdit can do much more that Cuda Text, and in different test cases probably it will be a much better choice. But not for me.

I concur with trzeci that UltraEdit is by far the slowest in editing large text files compared to the other contenders being discussed here. I was not aware of CudaText before but just gave it a try also and it seems fairly rock solid compared to ST.