I do pay for premium but my impression of the parent was that this was independent of ads. The test I did in the other comment didn't trigger an ad for some reason even though I was logged out, which may be why it loaded so fast.
Ah. The parent mentioned several frustrations that I am not familiar with (presumably since I also pay for premium and don’t block the ads), but my impression was that the delay was caused by the code refusing to play the video until the time slot for the ad had completed even if the ad failed to load (as would happen when blocking the ad http request)