If you're reading numbers from Windows Task Manager, then be careful
because the numbers there aren't correct. If you care about these
things, get a better task or process monitor. SysInternals -- now part
of microsoft, but still not included in windows :( -- have free
downloads for all kinds and uses. They even have tools to show what's
happening in your computer if you are researching a specific slowness.
Apart from researching and being curious, do you have a situation
where Chrome takes so much memory that it prevents som other program
from working well?
How much memory does you computer have?
If you are satisfied with only knowing how much memory Chrome uses
(the real numbers!) you can also open a tab and type in the address
about:memory and look in the upper table for Total for Chrome. With
gmail, two tabs and one about:memory open my Chrome uses some 300 MB,
but I have very few plugins.
I know that Chrome uses a lot of memory to help speed up surfing.
Chrome is "keeping notes" of how to open your favorite websites
faster, which uses memory and speeds things up. There is also the
browsing history database, autocomplete (for omni addressbar),
autofill (web forms) and a bunch of other things. There's even a
database used to give warnings if you are about to click into a known
virus/malware website. All these are by default kept on your harddisk
for privacy, and cached in memory for speed.
If you discover your plugins use a lot of memory, there could be an
idea find which plugin is the worst and then write an email with a
screendump and ask the plugin author if they can use less memory.
There are some ideas towards making it possible to save memory for
plugins, like lazy-loading rarely used plugins. If you find some
specific places or situations where you think too much memory is being
used, please write again and give more details! :-)