Ah ya, it does sound like CPU throttling due to overheating. I have a Dell Lattitude for work also. (Dell Latitude laptop E6410)
I have researched this issue before for myself... An easy way to tell when its happening, your Task Manager will artificially inflate the CPU to 100% usage
Intel processors have a built-in safety mechanism - CPU Throttling. When the CPU gets too hot, it will slow down by A LOT, in order to try and save itself by cooling off.
Now here is where it gets stupid... Dell decided to hijack this safety mechanism and LOWER THE THREASHOLD in order to protect its other shitty components - RAM etc.
For me, the issue eventually resolved itself, after cleaning up the laptop and applying the latest BIOS, firmware etc. but while it was affecting me daily I would need to point a fan directly at it, to avoid the issue.
The main problem is that DELL advertised the laptops as "They are powerful enough to replace workstations (desktops)", but that's just not true - especially when you connect 2x 27" monitors.
That's the last time I ever get a DELL.
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