it's basically proportional to the clock-speed. That video comparison is just choosing an Intel CPU with comparable clock-speed, 3.2-3.6 GHz for the Intel to 2.3-2.7 GHz for domestic CPU. And also number of core limited to 4 or 8 cores, Zhaoxin and Phytium is using 8 core, because the video maker want to show how a 4 core Loongxin beats their 8 core even in multi-thread application, and compare a 4 core Loongxin with 4 core Intel CPU.From then onwards, CPU makers do variable clock speed, normally throttle at 3.5 GHz, turbo boost to 4.9 GHz with the 8th generation Intel in 2017, because high frequency cannot be sustained in normal use, otherwise it'd easily overheat for the average user without fancy cooling system. Nowadays, as in 2022, the top speed is still around 5 GHz, while throttled speed is still around 3.6 GHz.
Since stacking clock speed is hitting the ceiling, they started to stack multi-core. Sell you more and more core which most of the time sit idle in typical user scenario such as office work. Nowadays they give you economy core and performance core mixture. Performance per core didn't change very much so people are upgrading their PC less and less frrequently. Typically only gamer will feel the difference when playing games utilizing the full CPU.
But for gamers, nowadays GPU performance is more important and increase at faster rate. GPU is becoming so heavy they need extra weight support in PC. That's also why US ban Nvidia and AMD GPU instead of Intel CPU.
