Chunk unloading lag or chunk saving lag

Ryzen2700x
ssd
8g ram
6g mc
1g free

Chunk unloading cause huge lagspikes on integrated server.

When unloading chunks
D2 54-70ms
D32 8000ms
When loading chunks
D2 5ms
D32 30ms

Chunk unloading lag can be seen here:
https://youtu.be/g4fpWPCFbA0