Installed ghc uses too much memory?

Hello! My first time in the forums! I was installing haskell-platform via yaourt and I was surprised to see just how much memory ghc uses once installed in comparison to the download size... should I be concerned?
Thanks!
Here is some of the output.
==> Continue building haskell-platform ? [Y/n]
==> ------------------------------------------
==>
==> Building and installing package
==> Install or build missing dependencies for haskell-platform:
resolving dependencies...
looking for conflicting packages...
Packages (1) ghc-7.8.3-2
Total Download Size: 62.17 MiB
Total Installed Size: 787.85 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages ...

Trilby wrote:No the installed size is the package size. It is compressed for download. Would you prefer that packages were not compressed and took longer to download?
OK. I didn't think that it was reasonable that the package could be compressed to a tenth of its original size. That is what concerned me. I was wondering how there could be such a large difference between the two. But after opening the package it is clear that it really is compressed to a tenth of its size.
I know the packages are compressed.

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