The flick feature is hardware related. It's related to the wacom tablet and a matter of the tablet pausing to identify whether you're making a gesture ("flick") or actually making a brush stroke. It can cause hesitations, turning it off it won't try to figure out what you're doing and will assume it's a brush stroke. Did you read any of the info I posted for you?
As also mentioned you can try flattening layers, working in multiple smaller .ps files or lowering resolution. At that size 300dpi is a bit overkill, many people reduce it to 100-150 which would greatly reduce the file size while working on it.
You're already using one of the fastest i7's, it's a fairly recent model only outdated by the 4790k and 6700k. Photoshop benefits from faster cores and doesn't make much use of more than 1-2 cores so you could try overclocking the cpu a little. Is your ram completely full? In other words there's not much more that you could do to improve your hardware. Same goes with the gpu, only a small handful of tasks are gpgpu accelerated in photoshop. The rest rely on disk speed and ram, cpu power etc.
I'm not sure how you've decided it's a hardware problem when you don't know what the problem is (according to the question) and haven't tried solutions like others who work with similar hardware and software suggest like turning off the flick feature.
The reason I'm doubting it's a hardware issue, here's the upgrade options. Spend $1000 on a 5960x, the highest end cpu intel makes (aside from quantum computing or server farms) and 8 cores with 16 threads won't benefit you in photoshop. Move to x99 (lga2011v3) with a 5820k (still not needed but the lowest priced x99 cpu) to take advantage of 64-128gb of ram. For that you'd need ddr4 and 64gb (4x16 bought in a quad kit) is around $300-350, 128gb (8x16gb) is around $750-800.
It would be unfortunately to blow $2-3,000.00 just to find out a software setting on your tablet may have been your issue. In the end those type of hardware upgrades aren't going to help you a whole lot. The ram might be the biggest help. Do you have an ssd (separate) set up as a scratch disk? That may help. Run photoshop on your main ssd and have another set as your scratch disk to prevent any potential storage bottlenecking.
It's your call, the issue is at this point upgrades are costly and there's not much of a difference in performance. Not with photoshop anyway, if you were limited by cpu cores or something I could see where it may help. They don't really make faster consumer grade cpu's or hardware and even enterprise xeons and things go wider (more cores), not faster. I highly doubt it's a hardware problem, at least not with the pc itself given the specs you listed.
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