May I face any problem (like lagging) after upgrading to OS X Yosemite?

I have a macbook pro 13 inch retina display (Core i5, Ram: 4GB, 128 GB SSD etc). Is that configuration okay for the upgrade? or may I face any kind of problem (lagging in performance etc) in future?
thanks!

I have a 2011 MacBook Pro and with Yosemite the machine runs faster.  The memory usage algorithm is significantly better so the memory pressure is about half of what it was under Mavericks.
If you install, first thing to do is then open Disk Utility and Repair Permissions then restart.  They seem to be messy  after the install.

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