Split out performance data to its own md file

README.md

@@ -36,13 +36,7 @@ Example config file is available here: [azulscsi.ini](azulscsi.ini).
 
 Performance
 -----------
-With verbose log messages disabled, expected SCSI performance is 2.4 MB/s read and 2.1 MB/s write.
-Slow SD card or fragmented filesystem can slow down access.
-
-Seek performance is best if image files are contiguous.
-For ExFAT filesystem this relies on a file flag set by PC.
-Current versions of exfat-fuse on Linux have an [issue](https://github.com/relan/exfat/pull/101) that causes the files not to be marked contiguous even when they are.
-This is indicated by message `WARNING: file HD00_512.hda is not contiguous. This will increase read latency.` in the log.
+Performance information for the various AzulSCSI hardware models is [documented separately, here](Performance.md)
 
 Hotplugging
 -----------