When atom first came out and i tried I said no thank you as it genuinely was painfully slow.

I have been using atom now full time for 3 weeks and gave it another chance as I love a lot of the plugins it has and the community and I am very impressed.

Regarding its slowness it has improved a lot. The only complaint I have with its speed compared to a native app like sublime is that it is slow in starting. This doesn't affect me much as when I am working on a project I leave it open all the time anyway :-)

Give it a try and get some of the useful plugins and you will never look back.