I have ubuntu amd64, and i want to install packet tracer on it. the thing is, packet tracer requires a lot of 32 bits libraries to work.
So, does installing a lot of libraries makes linux slower or less reactive, or it doesn't affect it in anyway.
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Libraries are just files on your disk, they do nothing until you start a program that uses them. They won't get automatically loaded into all programs (that would be very useless). Therefore just having them installed shouldn't affect anything else.
However, some package managers might get slower if you have too many packages installed. I think Debian's
apt-get used to get slower over time.
Also, sometimes programs drag in various other dependencies – including services, not just libraries. (For example, media players might pull in avahi-daemon or something.) On some distributions like Debian, services get started by default when installed (even if not really needed), so that might also make things slower.
(Although even that shouldn't make general usage slower. Even if useless junk takes time to start, normally it doesn't use any CPU when running idle.)