We have been using Blender v. 2.76 for video editing for a while.
We upgraded to 2.77 when it came out but even files that used to play back quickly started to suffer from slow previews in the video editor (7-8 fps) when it was supposed to be 30 fps. At the time, we rolled back to v2.76.
We just upgraded to v2.78 and have the same problem.
Is this a known issue?? How is this fixed??
Windows 10 Pro
gpu Intel HD 530
RAM 16 GB