Render stuck at low resolution for a long time

[tangfucius]

My viewport gets stuck at a 30x52 resolution for a long time (around 10 minutes?), even after training is finished, while vanilla Nerfacto can render at 512 resolution in a few seconds. I know that my GTX 1080i on Windows is subpar for the task at hand, but is Lerf supposed to be this much slower than Nerfacto?

[CorneliusHsiao]

In my case, the issue was: the viewer is stuck and stops rendering. My solution is: use mouse to change viewpoint a little.