Input slow and lagging in Yosemite in most apps

At first I thought the problem was limited to one or two applications, but I'm seeing it in almost all my apps now, including Apple generic apps like Mail.
Basically, I'm experiencing keystroke lags - time between entering characters and when they actually appear. This can happen here at these discussion forums for example. Or when composing a new Mail or replying to a Mail and in other situations.
In some apps I don't see any lag at all. Like Terminal. Or BBEdit (since upgrading). But in many apps I am experiencing this, since upgrading to Yosemite. I'm experiencing it right now while composing this message.
My physical RAM is 16 GB. The activity monitor says that 15.85 GB is used and there is a virtual memory of 24.40 GB and swap used of 673 MB. App memory is taking 10 GB, the file cache 1.5 GB, wired memory is 2.2 GB and compressed memory is 2.48 GB.
I'm not sure why so much memory is being used. Could that be the cause? Or is it some "Yosemite thing" people are experiencing in general?
Thanks,
doug

Generally, no, things shouldn't get "clogged up" and necessitate a restart. I've been running Yosemite since the first public beta, and have not seen any performance issues that require a reboot.
If you go to Activity Monitor, and show all processes, are there any processes taking a LOT of RAM (say, 4+ GB)? You have some virtual memory in use, and if a system has to swap to disk it is noticeable performance-wise. If there's a memory hog application, perhaps it has a leak and quitting/restarting it could improve performance. You have a machine with an SSD though so "paging" to disk shouldn't be THAT slow compared to machines with a spinning hard drive.

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Input slow and lagging in Yosemite in most apps

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