Topic UI upgrade?
Well for all in one UI addons these are what I know of someone tell me if im wrong.
elvui pic (might be an older version)
Of them all BobUI is probably going to be the lightest as it's really more or less a skin for the default UI tuk will be second and elv/lui are probably gonna be the most taxing.
though there are plenty of other UI's you can try
Skullflower's UI is a mod of ElvUI from Tukui. I've used it since my GM showed it to me and it has literally everything I need and more. VERY minimalist. In fact, minimalism is its selling point on the page!
It is customizable from the /ec menu, and does not interfere with recount, omen or skada as far as I know.
The little guide pic on that page will serve as an effective readme for the installation. After that, there's just a quick configuration script when you first run it on a character, after that you're good to go.
Tracks important fight targets like adds, bosses and enemy arena team players automatically. Also, so pretty.