It is a pretty well known and early discovered issue.
Here is more about the PT8 CPU Usage problems:
PT8 CPU Usage
Welcome to the club
These are some of my posts from that thread:
(...)
On average 30% usage of the quad core CPU (Intel Q6600 on Asus P5K Deluxe + graphics on Radeon HD2600Pro) with Edit and Mix windows opened and extended over 2 monitors.
When minimized , usage goes to ca. 3% (!!!). Opened (maximized) jumps up to ca. 30%.
Even when I'm running a session of 20+up audio tracks with very limited EFX (dverb, 2 delays) the usage stays at almost the same (?!) level of around 30%...
(...)
When I
minimized PT Mix and Edit windows or opened
anything on top of it, I had no problems anymore
...
As I mentioned in my previous posts, the
Windows Task Manager with
opened PT Edit and Mix windows - with no activity (no playback, no playing VIs, etc...) - is showing 30+% CPU Usage although the
PT CPU Usage indicator is very low.
I have a multiboot system based on Intel quad Q6600, ASUS P5K DeLuxe WiFi (disabled), Radeon HD 2600PRO 512MB 128-bit, ARK 4U-500-CA Black 4U Rackmount Case... 002R.
... So I tried my boot
with PT 7.4 on it and... the problems were gone !!!
Windows Task Manager CPU Usage stays below 8%. Playing even complex VI's does not even touch it! Everything is rock solid.
(...)
= = =
I checked both, MoBo onboard firewire and approved PCI Firewire card - NO DIFFERENCE, the same problem.
We (in this thread) are using different GFX cards, so the problem is not related to it.
= =
Robert
PT Native 8, 002R, Intel quad Q6600, ASUS P5K DeLuxe WiFi (disabled), RAM: G.Skill 4GB (2 x 2GB DDR2 1066), Radeon HD 2600PRO 512MB 128-bit, ARK 4U-500-CA Black 4U Rackmount Case...