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Given how your task is set up (as far as I recall from previous posts): No. The selection of the 12 out of 600 stimuli only happens once the task starts. For performance reasons (stimulus and response timing), Inquisit does not fetch files from online sources at runtime; all files are downloaded to the client machine before the experiment starts to execute on the client, and that means 600 pictures in your case. As far as I can see, the only thing you can do is try to reduce the file sizes of your 600 images as much as possible.
For everything else, you'd have to (a) re-consider your design (e.g. compile certain fixed sets of 12 images in advance) and (b) switch to Inquisit 4 (different sets could be loaded via conditional <include> elements, which are not available in Inquisit 3).
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