This is so tricky, cause a list could keep growing and growing. We can not “pre-load” 50k topics when you click the button, that would explode a lot of things. There are tricks (we could pass relations around) but it gets very very complicated.
A tiny improvement that may help you here is if we “remember” you clicked “select all” and then auto select the batch we load when you lazy load it.
At least it makes your process significantly easier to work through (you just scroll and scroll). Does that sound like an adequate improvement?