Please fix performance issues on CPU-limited systems

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yes, to view the FPS monitor
Brief description of the issue:

I have been using this simulator since day 1. I have constantly messed with and changed settings to get the sim to run better. Nothing works. I have tried absolutely everything. The sim always says “Limited by mainthread”, my CPU is only a few years old. I get only 15-25fps on the ground with a ton of stuttering. I fly large airliners, and they’re unplayable. Each update makes it run worse and worse. This has gotten from frustrating to extremely frustrating.
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Detailed steps to reproduce the issue encountered:

PC specs and/or peripheral set up if relevant:

Intel Core i7-6700
NVIDIA GeForce RTX 2060
Latest Windows 10
Build Version # when you first started experiencing this issue:

From launch day to now!!

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