Same here. Joplin works fluently on my desktop pc.
My enviroment is this:
Version: Joplin 2.6.10
OS: Windows 10 Home Version 21H1
System: Processor: Intel(R) Core(TM) i3-4170 CPU @ 3.70GHz
RAM: 8,00 GB
System type: 64-Bit
Sync status (synced items / total items)
Note: 856/856
Folder: 33/33
Resource: 2828/2828
Tag: 230/230
NoteTag: 2151/2151
Total: 6181/6182
HTH