I was messing around with the newest update on a buddies pt system and the cpu spikes were pretty bad. It's on a Windows 7-64 bit machine running the latest PT10.
Make sure your saffire isn't set as your windows sound card. Only use it with pro tools. The asio messages went away for me once I did that. Never had a clock issue.
Also keep up with the lastest drivers here.
http://beta.focusrite.com/releases/saffire_mix_control/
Offering drum quantizing services! Quick turn arounds.
Also doing programming if you need drums written for your song/songs.
PM me here or email me at kolossalstudios@gmail.com
Thanks!