when i was on dialup with an accelerator
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If you are on dialup, the "accelerator" apps will probably break Impulse. These basically heavily cache commonly accessed websites to give the appearance of speed, when you're really just loading them locally. Obviously, if they try to do this with Impulse downloads, you'll end up with some portion of the download cached, and then Impulse being directed to download it from the cache. If possible in the caching software, have it ignore anything through Impulse. If not, disable it when downloading.