Ok after reading comments about performance compared to sublime. I wanted to try this out myself.

I opened a 7.5K LOC on both atom and sublime, atom was responsiveness and no lag.

Second, I fired up my linux machine and filled a log file with 159K lines. I use vi first and no lag. I opened it on atom, it was slow, took more than 30 secs to basically show the file, not completely loaded. And finally, I opened that log file on sublime, bam! instant load, no lag.

So, yes, I can see what fellow HNers have been saying about the performance.

cpu: intel core i5 680 @ 3.60GHz, Memory: DDR3 12G, OS: Windows 10 Professional