[FridgeSeal]

I use Sublime Merge pretty much every day, and it's nothing short of fantastic.

It's properly fast, the diff/stage/commit/etc UX is excellent. I particularly enjoy how straightforward it makes it to hand-pick lines from multiple files really quickly. The interface abstracts over enough of the Git ux/api to make it get out of your way, but in a way that doesn't make what it's doing a mystery or too out of your control - hovering over a button will often yield the equivalent git cli commands for example.

Personal preference here, but it's also not an electron app, so it's very resource light.