Slow Login Troubleshooting

Computer Type: PC/Desktop
System Manufacturer/Model Number: Lenovo IdeaCenter K450
OS: Windows 10 Pro X64 21H1 19043.1503
CPU: Intel Quad Core i7-4770 @ 3.4Ghz 4th Gen
Memory: 16.0GB PC3-12800 DDR3 SDRAM
Graphics Card: EVGA GeForce GTX 780
Sound Card: Realtek HD Audio;
Monitor(s) Displays: Samsung C27F398 27" Curved Monitor
Screen Resolution: 1920x1080
Keyboard: Dell USB (KVMS)
Mouse: Logitec USB (KVMS)
PSU: CoolerMaster MasterWatt 550 Watt Semifanless Modular
Hard Drives: 1.0TB Samsung QVO 860 SSD SATA-6GB; 2TB Seagate ST2000NM0011 72K SATA-6GB; 2TB Seagate ST2000DM006-2DM164 72K SATA-6GB
Internet Speed: 484.75MB Down, 23.59MB Up
Browser: Firefox, Edge - eM Client Pro for E-Mail
Antivirus: Windows Defender; MBAM Premium
Other Info: Purchased December 2013, many upgrades since then

Computer Type: PC/Desktop
System Manufacturer/Model Number: Dell Inspiron 660
OS: Windows 7 Pro X64
CPU: Intel Core i3-3240 2X3.4Ghz
Motherboard: HP 0A68h
Memory: 8GB 2X4GB PC3 12800U DDR3
Graphics Card: ATI FireGL V3300
Sound Card: Realtek HD Audio
Monitor(s) Displays: Acer KN242HYL 24"
Screen Resolution: 1920X1080
Keyboard: Dell USB (KVMS)
Mouse: Logitec USB (KVMS)
Hard Drives: Kingston SA400S37 120GB SSD (boot) Toshiba DT01ACA200 2TB SATA
Internet Speed: 175.42 Down, 23.62 Up
Browser: Seamonkey, Internet Explorer
Antivirus: Microsoft Security Essentials
Other Info: Apache Webserver since 2001