I would think this is a PC issue as suggested by Graculus. If you have an elderly machine and/or lots of other things are tying up your system resources (processor or memory intensive), then all sorts of things will slow down and start queuing up for some love.
See if you can clear your browser cache. (I say this because Chrome on my tablet does not have the facility to clear the cache. The tablet has a stonking battery, so that although it goes to standby, it is never off - I recently noted that it had been up 1050 hours - and I sometimes hear email arrive while it's on standby. If the response gets slow, I boot the tablet. In however many months I have booted about three times.