Ok since the new update (18/9/13) is seems it has solved the problem.

Will continue testing and I come across any issues I will ypload my DxDiag.

Away from pc until next sunday, this will be my only response until then.

Sorry for not uploading DxDiag

Settings at the time were all settings standard except shadows at high, PIP disabled, Dynamic lights Disabled, all motion blurs disabled, 2x anti-alaising, no other image sharpeners enabled and also tested with many visibility combos, with little or no improvement.

Sorry with any inconvenience about no DxDiag and hopefully will be fixed when I get back on sunday!

Game on
The Maxibonz

Same here, Stratis works fine, Altis not so much - My specs:

Core 2 Duo E8300 @ 2.83Ghz
Sapphire AMD HD 7750 1g low profile
2G DDr2 RAM

Used to run stratis on 20-40 fps