I'm noticing great hangs of blender 2.82a on windows 10 when videos are used as textures of 3d objects using "Image texture" nodes in the Shader editor. It only takes as few as 5 1080p60 textured planes to make the "material preview" and the "rendered" viewport shading modes unusable due to multi-second freezes whenever anything is done that even remotely concerns these particular objects such as seeking and scrubbing in the timeline or editing keyframes. In addition, viewport playback is very slow as well running in the low 20 fps even tho the project is set at 60 fps and there is an initial 5 seconds freeze when hitting F12 to render a single frame. I'm using Eevee renderer and sRGB color space.
When the freezes happen, the task manager shows that blender uses 25% of the cpu, meaning that it is maxing out only one of the four available cores, even tho not even using all of them would make the situation much better. GPU stays unused throughout (a gtx 1070) as well as the ssd.