Thanks for the solution.
In the above environment, a certain effect was certainly seen by changing from GoogleIME to MS-IME. (I'll keep an eye on it for a while...)
However, in the following environments, it is noted here that using GoogleIME does not cause any problems.
<Environment>
OS: Windows 11 Home
CPU: Intel i7-9750H
MB: RAZER
MEM: 16GB
GPU: NVIDIA GeForce RTC2070Max-Q
DirectX: 12
OS and GAME are SSD on the same drive.
CPU? GPU? It is presumed that there is an error in some combination, but I hope that it will be completely resolved.
For your reference
The causal relationship is unknown, but before the symptom improvement, the FPS measurement was only 60-65.
After symptom improvement, FPS is 100-120, maximum 300.
If you can help me solve the problem...