PC Bottleneck help

[default1n75viiip5q4]

My team has four what i would call rather beefy PC's. However, we've each noticed some extreme lag and previewing issues when working in Premiere and After Effects as well as other system tasks. Our company spent a great deal of money on these machines and in my opinion, they should be working leaps beyond what they currently are. Can anyone smarter than I at PC's give me any ideas into what our bottleneck may be? I appreciate any insight anyone can give.

OS Name Microsoft Windows 10 Pro
Version 10.0.19041 Build 19041
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name STUDIO-W10-PC1
System Manufacturer ASUS
System Model All Series
System Type x64-based PC
System SKU Unsupported
Processor Intel(R) Core(TM) i7-6950X CPU @ 3.00GHz, 3001 Mhz, 10 Core(s), 20 Logical Processor(s)
BIOS Version/Date American Megatrends Inc. 1701, 3/31/2017
SMBIOS Version 3.0
BIOS Mode UEFI
BaseBoard Manufacturer ASUSTeK COMPUTER INC.
BaseBoard Product STRIX X99 GAMING
BaseBoard Version Rev 1.xx
Installed Physical Memory (RAM) 128 GB
Total Physical Memory 128 GB
Available Physical Memory 118 GB
Total Virtual Memory 256 GB
Available Virtual Memory 244 GB

dual NVIDIA TITAN Xp

Intel Raid 1 Volume (Samsung SSD 960 PRO 1TB)
Samsung SSD 960 PRO 1TB

Display 32" ASUS XG32V
Connection Mini-Displayport
Desktop Resolution 2560x1440
Active Signal Resolution 2560x1440
Refresh Rate 1.00 Hz
Bit Depth 8-bit
Color Format RGB

[Vishu_Aggarwal]

It can be the issue of the Video Rendering & PlayBack.  Go to File > Project settings > General > Video Rendering & PlayBack > Change to mercury playback engine Software only. The same option is available in the After Effects. 

if changing the above setting resolves your issue then it is related to the graphics driver. Try updating the graphics drivers to use GPU Acceleration.

Also, check the system compatibility report under the help menu and see if anything is not compatible with premiere pro & After Effects.