Are you on a Mac(book) ? I've tried fixing it, seems to be a rendering issue with upscaled text looking bold. It can be fixed with CSS but the editor use a canvas element. Ive not put much effort fixing the issue thought because I think it looks OK.
Thank you for your honesty and comments, they are much appreciated.
I will look into putting this information down on a developers page so that individuals (such as yourself) who want more detailed information don't have to look too far; while others are not forced to know all the ins-and-outs as soon as they land on the homepage.
If you have any specific questions or concerns until then, I am happy to answer them.
Not free though. You can also add VSCode to the list. It's faster than Atom but slower than sublime (Which is also not free). Also it may be good to start with a plain editor than a fancy one like JetBrains and later purchase a fancy IDE when you have learned the inner workings to improve your productivity.