I am having problems downloading files from the web. After a number of files are downloaded, the system become sluggish, and then hangs. I traced the problem to the download history file: downloads.sqlite.

After downloading a number of 1.0 MB files, the system became very sluggish, and I started to get lots of (Not Responding) messages when trying to download or just use Firefox for browsing. Using Performance Monitor, I observed that the Firefox executable was growing larger and larger - up to as large as 1.2 GB on a system with 2.0 GB memory. Page faults were off the chart.
Looking for a similar problem, I found one that discussed the downloads.sqlite file becoming corrupted. I first noticed that this file was over 600 MB in size, so I deleted it. I then downloaded additional files, and observed that the new downloads.sqlite file would increase in size by about 150% of the size of each file that was downloaded. Once it would get up to 500 MB in size, the system started slowing down again.
I don't know the purpose of this file, but it appears that it keeps a full copy of every file downloaded, which may be the function of a download history file, but it does not seem correct that the file should grow in size without limit, and thus impact the system.
I would also appear that the Firefox executable is trying to read the entire contents of this file each time a new file is downloaded, which does not seem right.
Temporary fix is to periodically delete the downloads.sqlite file when it gets too large and starts impacting performance.. Apparently it is smart enough to open a new file if the old one is not found. I am not sure what the correct behavior for this file should be. Apparently is does not re-initialize when a new Firefox session is initiated.
Please feel free to contact me if more information is desired. I'm not sure what details you might need to troubleshoot this type of problem.

Hi Katy, and a warm welcome to the forums!
What is the exact name of the file?
Is it aim.bin?
Which requires either Stuffit Expander, or the Unarchiver to deflate.
http://www.apple.com/downloads/macosx/systemdiskutilities/theunarchiver.html

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