If you want "Open Source Sublime" check out CudaText. Loads fast too. Plugins are Python (like Sublime Text) but whole thing is coded in FreePascal using Lazarus. It's really capable.
Also, looking at its repository, CudaText currently only has 1 active contributor, which is a little worrying if I want to use it as my main text editor. I hope the community around CudaText become bigger because I think the concept is good, and I really hope CudaText can be on par with Sublime Text.