We're having a long hard think recently about open/click tracking and ways to make it less invasive.
We're making good progress on this in Workflows already and believe it's having a net-net improvement on results but it'll take us some time to improve it.
If you already know that open and click tracking is not the best way to monitor the performance of your marketing just add this to your site as an Environment Variable:
turn_off_link_tracking = true turn_off_open_tracking = true
This will disable it immediately (even if you have campaigns going out now).
Any questions, just ask.