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I'll play with buffer size but I've read that just increasing the buffer can cause other problems.
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The ONLY downside to a bigger buffer is latency (delay) and that's only a problem if you are monitoring yourself through the computer and it's difficult to perform.
I'm not an expert on this and I'm a Windows user, but
it's usually related to multitasking and your operating system is always multitasking even when you're only running one application.
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Now I have a 2019 MacBook Pro and it’s dropping like crazy with the CPU hanging around 3%.
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It's not always related to total CPU usage. Some other application/driver/process just has to "hog" the system for a few milliseconds too long and you get buffer overflow. A faster computer usually helps because it can finish-up the other tasks faster. But, your newer-faster computer is probably doing something that your older computer wasn't doing.