Slow copy speed to mounted google drive with windows file explorer

But then…what should i set the vfs write cache size to.

As i said, i mainly copy large files to g drive, and if i need to have 1tb local space for cache in order to upload a 1tb file eith fast speed…thats a big problem…So is there any formula for the size of cache per uploaded file size?
Or, can i set the location of the cache to the location of the file i need to upload, so it could start using copy immediately?(detecting the file is in the cache directory, so assume the file is in the cache and start upload immediately, without putting the file in cache)