Hummnn, 3 days with no replies . . . THAT is unusual . . . =)
What OS are your running?
What CPU do you have, Intel or AMD? Is it a dual core / quad core?
What video card are you running?
Are your video drivers up to date?
Click here for ATI
Click here for Nvidia
http://www.gog.com/en/forum/arcanum_of_steamworks_and_magick_obscura/scrolling_very_jerky/perm=7/#p_b_7]Did you try the -no3D -dubblebuffer switches?
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If running Win 7 / Vista - Did you ...
install as an administrator?
turn UAC off before installing? (see attached image)
install in a directory outside of Program Files?
right click the game shortcut, click Properties, click the Compatibility tab and check mark "Run this program as an administrator"?
try using different compatibility modes, starting with the newest and working back to the oldest?
install all mods as an administrator?
try re-running (as an admin) the HighRes.bat located in the Arcanum install directory . . . trying different resolutions. That failing, run the HighRes.bat (as an admin) and uninstall / reinstall the HighRes mod.
If you have a dual / quad core CPU, did you try setting the affinity to a single core? You can do it manually by starting the game, ALT-TAB out of the game, open task manager (CTRL - ALT - DEL ), find the [game name].exe on the Processes tab, right click the exe and click Set affinity . . . on the resulting dialog. Un-check all but the CPU 0 check box. (See attached image) Close the task manager and play the game. If this helps I suggest using RunFirst as it sets the affinity for the game without having to go thru the task manager process each time you play.
If running an AMD dual core CPU, did you try the AMD Dual Core Optimizer ?
If running Win 7 / Vista 64 bit, did you try limiting the memory? (see attached image)
Look over the Arcanum support articles.
If you've tried all of the above I have nothing else . . . =)