Considering that this is a FF issue and not a SpyBot issue, I would like to make a recommendation for 3.0, if I may. The way to remove this slow-down would be to load the hostperm file into memory as an array of classes or strings and simply iterate through it each time it is needed, instead of reading the file each time it is needed. We all know that memory is faster access than a hard-drive, so that would help a TON. I would also recommend using an array over a linked-list because a linked-list could span page-faults, thus slowing down access, whereas an array is almost always going to be in the same page.