freeze function button to speed up large files

Someone who knows the code, wrote much of the code, and knows Photoshop inside and out just told you how Photoshop works. That's not something you argue with.

Photoshop does cache intermediate compositing results, in memory and on the scratch disk as needed. What needs to be cached is the composited result underneath the layer you're working on, so it doesn't have to be recalculated as you change the target layer. Some groups can also be cached, along with transformed and filtered results from Smart Objects to reduce recalculation. Of course, not everything can be cached, because of adjustment layers and blend modes above your target layer.

The whole point is that your "workaround" is doing exactly what Photoshop already does by default -- it isn't gaining you anything.

well maybe it does, but its not just a little bitty faster when i do this manually, it`s 1000% faster. if you don`t know this problem you don`t know big files.

well and if there is only one layer active beneath where i`m working in my file - there is nothing that needs to be cached. thats maybe why it`s faster

maybe you should capture on video a comparison? youtube it.