Hey there, I also love this mod a lot, and in smaller bases it's hardly noticable on the performance, but somewhere along the way the turrets would idle at a 6+time usage, increasing beyond any computic capabilities when I so dared to even just lay down a simple flooring blueprint to berid my eyes of any sight of nature. So it was time to look for solutions, I was just about to go dive in the lua's myself when I found the first step towards a meaningful solution. The fanmade Mod ''No Bot Charging Repair Turret (Redux)'' by jjerhub. This work of devotion already cut down the time usage down to an idle around 1, a magnificent improvement. But the drain when I come back to just tiling any amout of space is quite extensive again.

I'd love to see you integrate the fanmod and maybe work some more magic to improve UPS, and if its just another mod setting, allowing me to cut the update interval in half or whatever.
For reference, the UPS drain has become a detrement somewhere around a base size of 80 chunks, with 50k robots and 1k turrets (I just spammed them along my roboport blocks.) And yes I am aware that at this size, I have more problems then just your wonderful turrets, but for the robos and inserters are great UPS improving mods available and in usage, im just going through everything i can to increase performance and keep GROWING.

Namaskar