I just bought a new laptop, with 32GB DDR4 memory, as well as Intel Core i7 8750H processor, NVIDIA GeForce RTX 2060 6GB graphics, 512GB PCIE M.2 solid state drive, 1TB hard drive, etc. This was because my old computer lagged, and I had some graphics driver errors coming up, which I thought was the problem. But the textured mixer brushes (I'm using "Kyles", which Adobe endorses) still lag, when they're big. I can work on an A4 document at 600dpi, or an A3 at 300dpi and they still lag (though the latter lags less). Haven't tried anything bigger. Even the non-textured ones lag, as well as other brush sets I've used. The laptop is plugged in, and I have all the latest drivers for my graphics card, and the Wacom 13HD tablet I use with it. I've gone through and optimized Photoshop's performance (it has 85% of the RAM allocated, and the scratch disk is the SSD; I'm storing the paintings separately on my hard drive). What makes it weird is that, despite the unworkable lag, Photoshop claims to be running at 100% efficiency, and my computer stats report not using more than max %30 of the RAM, CPU and GPU at any time. So why is Photoshop lagging instead of using the extra processing power to run better? I've contacted Adobe Customer Support several times over this, but nothing's solved the problem so far. I've done screen shares twice, and will continue following it up. However, if anyone else is experiencing the same problems, I'd appreciate any feedback or "me too's" on this post, in case it's a bug Adobe needs to address. I'll let you know if it gets fixed, too. So far I've trouble-shot turning different graphics drivers off, fiddling with a whole bunch of performance settings, installing older versions of Photoshop, etc. Note: Smoothing and sample all layers are on when I paint, but they need to be. They're features I like to use, and my computer *should* be able to crunch them.
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