If you want to try and diagnose to see if that is or is not a factor in your xactimate performance, there are a few things you can try, however if you have a computer guy you trust you might be better off asking for their help.
I looked at the manual for your W520...
https://download.lenovo.com/pccbbs/m...w520_ug_en.pdf
And it sounds like the quickest test to see if you have the Optimus installed and enabled is to "Right-click on the desktop and select NVIDIA Control Panel. The NVIDIA Control Panel opens." If you do that, you are likely good to go, and the Optimus is not related to your xactimate performance issues.
If however the NVIDIA Control Panel is not an option, then there are a number of places you would need to check for potential problems. The easiest would be to right click on "my computer" (or sometimes just "computer") in Windows File Explorer, and go into device manager. Or you can use the start menu and search for "device manager."
In device manager, you should see something like this...
On your computer, you should see something about Optimus, or NVIDIA, along with or in place of the Intel Display Adapter listed. (Yours will look different from mine, just pointing you to the area.)
If it's in there, but has a yellow exclamation point on it, or there are other things with yellow exclamation points, then it is possible you may need to update drivers.
https://pcsupport.lenovo.com/us/en/p...w520/downloads
Now is the time to call in a favor from your computer guy, if you have one.

If you don't I could try and help remotely, etc., if you wish.
You may be missing one or more drivers, etc. There are Lenovo tools on that support site I linked above that will scan your system to look for missing drivers like Lenovo System Update.
https://support.lenovo.com/us/en/solutions/ht003029
If everything looks good in device manager, then it may be your Power Settings, or BIOS.
From the manual I linked above, for the Optimus driver to switch to the discrete NVidia Graphics Card, it has to think it has the "power" to do that. Namely that it is plugged in and not running on battery, and that the Windows Power Settings are set in a way that do not limit performance in favor of saving the battery. To check your power saving settings, use the start button and search for "power saving" and go into that control panel and try and change your settings to settings that will allow the computer to perform at its highest power potential without any regard for power savings or battery savings.
If none of that works, and the device itself does not show in device manager, then we would have to check the BIOS of the computer and make sure it is not disabled there. There are some pages in the manual that describe this procedure as well.
Lastly, we should make sure before you go down this path that we identify exactly what model laptop you have just so we know what it
should have. There's a chance it doesn't even have Optimus, although unlikely. If you look on the bottom of the laptop, potentially under the battery, you should be able to find the model number and/or serial number. If you will post that information I can double check the features that your notebook is supposed to have.
I'm about as far away from Thornton as one can get without leaving town, but if you want some help with this I would give it a go as I enjoy these sorts of things, and making computers work to their potentials. I'm typing to you on my 2008 built homebrew machine. Still does what I need it to do.
-John
PS. Edit to add, that you might
start by checking your power saving settings, as that would explain the change in performance. Maybe as your battery got less and less powerful over time, you dialed down your performance settings in an attempt to conserve battery, and now the device is not (ever) engaging Optimus mode, and therefore xactimate is suffering. So start by checking that.