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Anything and everything you run slows your computer down by some degree. It is a measurement of it's impact, and your computer, that determines how severely. On an old enough PC, even notepad can lag your PC! (I'm talking a 25 MHz 486 with 92 MB of RAM running windows XP here, but I digress..)

Pandora uses Adobe Flash as a backbone, which is a resource-intensive (and very unstable, crashy) infrastructure. Luckily it does not actually DO a lot in the case of Pandora. However Pandora does two things which can become resource intensive.

The first is that it caches songs into RAM when playing, and streams them to it. On average, it uses 64 MB of RAM in Google Chrome (105 MB in IE8, and 320 MB in Firefox) to start, and up to twice that as time goes on.

It streams music, so internet connections below 4mbit will likely feel some noticeable slowdown. Dialup will be almost unuseable (i'm not even sure Pandora works on dialup). Satellite and cellular connections will be almost unuseable, but Pandora will work with only mild to moderate skipping.

Secondly, it caches all of it's music onto your harddrive, via your browser's cache. While Pandora is running, this takes the form of swapfile- harddrive space used like RAM. If you have a slow HDD, or a HDD that is almost full, it will cause severe lag. However this is not usually a problem.

Even when closed, it will leave a lot of junk in the cache. So unless you use Firefox's 'Private Browsing' or Internet Explorer's 'Max Cache Size', you will need to empty your cache periodically to avoid excessive waste of harddrive space.

Pandora generates about 1/2 a MB per minute.

It also uses a bit of the CPU. However, any modern processor should be fine. I can run Pandora without problems when underclocked to 100 MHz on my AMD Phenom II x3 (triple core). So any 1 GHz single-core or better should be fine.

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15y ago

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