Vegas Pro 16 can’t handle 2.7K?

[Geoff Candy]

I to use a GoPro @ 2k7 and have no problems handling the video at 50P. The clip you uploaded was 2704×2028 (4:3) @29.97fps. Is your timeline set 4:3 or 16:9?

Put your clip on a matched timeline and had no problem with it. Then made 50 copies of that clip and put them on the time line. Struggled at preview set best/full but OK at ‘good/half’.

Clevo laptop: i7 6700HQ @ 2.6Ghz 940mx graphics