|Thankyou for your suggestion of Auslogic defrag. It worked quite quickly. Unfortunately, although not entirely surprisingly, this had no effect whatsoever on the game's performance.|
I have also heard the suggestion that, because the affliction seems moderately game-specific, it may be due to corrupted files or a corrupted directory. However, this does not seem to be the case as I have uninstalled and reinstalled the game in a different directory, with no effect on performance. This might be more worthwhile if I could do it on a different disk, however I have only the one unpartitioned hard drive.
I think I'll mention that, just in relation to the comment above, that I in fact live in the Southern Hemisphere, so we're going into the colder months. That aside, I can't imagine the graphics card overheating having this major an effect - not so consistently and directly after getting into the game. And not in a game which ran so well in (our) the warmer months of the year (I got this for Christmas - which means it was hot while I was first playing it (and running smoothly on high settings)).
I don't believe I've tried any registry cleaners, etc. Anyone know where I can download one for free? That'll work?
Although I'm still heavily doubtful that this would make any difference whatsoever. No offence intended, but this strikes me as a very specific problem, with a very specific cause and thereby a very specific solution. I think it unlikely that any of the 'generic' fixes are really going to do it (except for maybe reinstalling Windows - and I don't like the game(s) enough to be bothered to do that).
I'm not sure I'm entirely getting my point across of just how big a change in performance we're talking, so I'll now list the graphics options of when the game (NFS Pro Street) ran smoothly and now:
Then: (Game ran smoothly; could've possibly put the settings up higher)
Resolution: 1024 x 768 x 60Hz
Texture Filtering: Trilinear
World Detail: High
World Lighting: On
World Shadows: High
World FX: High
Car Detail: High
Car Effects: High
Car Damage: High
Now: (Game runs with very poor frame rate and in slow motion)
Resolution: 640 x 480 x 60Hz
Texture Filtering: Anisotropic
World Detail: Off
World Lighting: Off
World Shadows: Off
World FX: Off
Car Detail: Low
Car Effects: Off
Car Damage: Off
Just in case you didn't see how big a change we're talking...
And in both cases, the performance mentioned was consistent. Then, the game consistently ran smoothly every time I played it, and now, the game consistently runs slowly right from the point where I get into it.