I have been looking at questions about Ubuntu 16.04 LTS running too slow. I have concluded that all those asked questions were either having too old PCs or Laptops or Nvidia graphics.
I have a fairly high spec configuration:-
6 GB RAM, Core i3 (2nd gen), SSD 256GB + 1TB HDD
The issue is very serious when I start playing video in chrome of even Firefox for that matter. There were answers saying tweak with your Chrome settings Andersen I even did that but the issue persists. Sometimes the system hangs everything and I can see chrome/firefox consuming 100% CPU. Things used to work really well until 14.04 LTS. I can see a lot of graphics improvement in 16.04 LTS but that has made usage of Laptop quite impossible.
Here are my graphics details in case they can help answering this question.
*-display description: VGA compatible controller product: 2nd Generation Core Processor Family Integrated Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:29 memory:dd000000-dd3fffff memory:c0000000-cfffffff ioport:e000(size=64