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Mark, since the behavior started after a BIOS updated provided by the Laptop manufacture, I would recommend you to get in touch with them.
You may check if you can restore your computer to the last working state by choosing “System Restore” once you’re in Windows (if you are using this OS)
After figuring out how to get the system restore to work correctly (err, disable AVG ) The system was back to the expected performance, quite a difference, be really nice to figure out how and why.
There was a bit of manual work between each compile listed above.
Here's the compile times 'only' measured with a stopwatch
When system slow 52 seconds
When system fast 15 seconds