The only issue left, being that lines tend to be slightly jagged if drawing fast, also occasionally leaving long straight lines mid-curve, regardless of the brush used. Using 4k, turning off 'boost line smoothness' really does improve functionality hugely for every brush, to the point that all of the old brushes that would previously give me lag even when the monitor is set to 2k or lower, no longer do at all, in that way, everything feels the same way that 32-bit felt. When i get a bit of free time next week I'll try out factory resetting my previous M1 Mac Mini and installing TVPaint on it without Wacom drivers or anything else possibly interfering to see if the issues still occur. I know that Clip Studio had the same jagged line issue (though not quite as severe) and there is a setting within the program that solves the issue, by switching the tablet settings precision mode to 'raw input (instead of 'prefer quality' or 'prefer speed').
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the only issue left being the jagged lines when drawing at any decent speed, so unfortunately 4k is still a no-go. The 4k display lag also still occurs heavily, though if the 'boost line smoothness' is turned off within the settings, the brush lag completely goes away. Quick update on the lag issues now i've installed on a new system (M1 Max Mac Studio), The 'sleep / switch display' form of lag is still something that happens. I will be upgrading to a Mac Studio M1 Max next week, so i can provide an update on if any of these issues do carry over to a fresh install on a seperate and more powerful system, though i have experienced the first lag issue on multiple other Mac systems. It used to be that outside of video editing, TVPaint was the only program i'd use for everything, these days the program doesn't hold up as a main software for me sadly. To be honest since i lost access to 32-bit at the end of last year i've only used TVPaint a handful of times. This form of lag is more manageable, because it doesn't directly affect the actual usability of the program and can be worked around. The other form of lag happens to me whenever the Mac goes to sleep and wakes up, or TVPaint moves from one screen to another at any time, the program will begin to lag severely until it is closed and re-opened again. There is no longer any work-around for this problem until it's actually fixed or TVPaint 12 gets released. the real shame is that for Mac TVPaint users, a 4k monitor is a huge waste of money, considering it's been 4 years and still seemingly no plan to fix that major underlying issue. For instance if i set my 4k tablet to 2k, the program runs pretty much without issue (though still brush performance is less optimised than it was on the old 32-bit version, even at lower resolution, but it's work-able). I feel that this kind of lag could be not as prevalent due to most people not running a monitor that is anything over 2k. The first instance brush engine problems was with jagged lines back around 2018-2019, and possibly whatever work-around was introduced to solve the jagged lines problem brought in the lag problems? It does not seem to be a Wacom driver issue due to tests with the tablet both plugged in and un-plugged, and drawing with the mouse or pen makes no difference. The lag has always been exclusive to the 64-bit version of the program. To me, it seems the lag is related to the physical size of the brush on the screen, and no relation to the in-program canvas size, a 1920x1080 project gets the exact same lag as a 4k+ project. at 4k any brush in the program will lag severely, with the issue severely worsening if the canvas is zoomed in.
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The first kind of lag occurs if i use tvpaint on a monitor resolution of anything over 2k. I've been having 2 seperate but possibly related lag issues: TVPaint 11.5.3 64 bit, M1 Mac Mini 16gb Ram.
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I've tried both USB-C and HDMI/USB and there is no change in behaviour between them. Although you know of my problems with the lag, i'll drop it in here too just for reference for anyone else running into similar problems.