I have found that temporary files are flushed much less by btrfs than ext4. ext4 will do a disk write io for every created file, even if it's only a temporary f

I have found that temporary files are flushed much less by btrfs than ext4. ext4 will do a disk write io for every created file, even if it's only a temporary file. For btrfs, new files that are deleted before write back will never hit the disk.