I looked at all the existing IDEs with only one contraint : Speed. And I found Sublime Text.
I had used ST2, it was awful so switch to Atom back in the years.
Since then ST3 has been released and I brought a licence the day after I tried it again as I was amazed about the speed!
I actually did the same for my Git UI app to visualise the history. I was using GitKraken until they did their upgrade where you need to pay and can't use it anymore for free, so I searched for an alternative which is also fast and I found fork.dev!
With those tools I feel like my environment is really fast. No more waiting for opening/closing those apps and opening/closing many files (which I do quite a lot everyday).
I really recommend you to have a look at Fork if you don't know it yet!
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