However one thing that may be very slow is uploading a lot of pics for comments with the same name.
i.e. when a pic has the same name as another, it is renamed with a number before the .jpg, I noticed that for some users these numbers tend to become very high due to the use of the same name all the time. The script which names the file was not made for handling cases like that, I just made it in case sometimes there are two files with the same name, not 2000 I should improve that by using a random number instead of increasing it sequentially.