I wouldn't. Speeding up just throws away frames which should look fine, no?

Been using VP forever and believe I understand when to resample and when not to, but to be sure, in the following "use case" is it best to resample?

I have a 29.97 clip on 29.97 timeline in 29.97 project and will render to 29.97. The video clip is more interesting sped up 1.5 times, should I resample?

Rich

There's no best rule, It's what you prefer, resampling will always result in blurred but smooth movement and no resampling will result in sharp but less smooth movement. In the case of speeding up, no resampling so sharp but less smooth movement, isn't probably not visible at all. Personally I use resampling only for slow motion at different speeds (but only not for 0.5 speed) and not for speeding up motion.

Also keep in mind that resampling takes some time, especially when using optical flow for resampling method.

To judge the result of resampling in the preview window it's important to set preview to best full.

The only time I re-sample is when converting frame rates, and even then I only use optical flow, not the usual resample mode, because it results in too much ghosting.

I use FFMPEG to resample videos for a couple of applications, but only use sample rates that don't require interpolation, i.e. 1/2, 1/3/, 1/4...1/100, 1/500... (or, at least, I think/hope that's what ffmpeg is doing, LOL).