I upgraded the Catalina to latest version and MacBook Pro started freezing up; went through the motions of NVRam, PRam, SMC, Reinstall of OS, etc. with Apple Support. When all failed, I formatted the hard drive and only after several tries reinstalled the OS. Several tries because in doing all these PRams and NVRams and what have you, the screen became psychedelic. Now, I have a Mac that is taking 2 minutes to load an app or 30 seconds to switch from one browser tab to another and the screen has psychedelic bands. Here is the ETRecheck report. Any help will be greatly appreciated as my Mac is basically unusable at this time. EtreCheck Report EtreCheckPro version: 6.3.1 (6D012) Report generated: 2020-08-16 14:02:01 Download EtreCheckPro from https://etrecheck.com Runtime: 22:53 Performance: Poor Problem: Computer is too slow Major Issues: Anything that appears on this list needs immediate attention. No Time Machine backup - Time Machine backup not found. Poor performance - EtreCheck report shows poor performance. This is unusual. Software performance problems - Software seems to be causing performance problems. Minor Issues: These issues do not need immediate attention but they may indicate future problems or opportunities for improvement. No Time Machine backup - Time Machine backup not found. Limited drive access - More information may be available with Full Drive Access. Hardware Information: MacBook Pro (13-inch, 2017, Four Thunderbolt 3 ports) MacBook Pro Model: MacBookPro14,2 3.10 GHz Dual-Core Intel Core i5 (i5-7267U) CPU: 2-core 16 GB RAM - Not upgradeable BANK 0/DIMM0 - 8 GB LPDDR3 2133 BANK 1/DIMM0 - 8 GB LPDDR3 2133 Battery: Health = Normal - Cycle count = 347 Video Information: Intel Iris Plus Graphics 650 - VRAM: 1536 MB Color LCD (built-in) 2880 x 1800 Drives: disk0 - APPLE SSD AP0256J 251.00 GB (Solid State - TRIM: Yes) Internal PCI-Express 8.0 GT/s x4 NVM Express disk0s1 - EFI [EFI] 315 MB disk0s2 [APFS Container] 250.55 GB disk1 [APFS Virtual drive] 250.55 GB (Shared by 6 volumes) disk1s1 - Macintosh HD - Data (APFS) (Shared - 146.48 GB used) disk1s2 - Preboot (APFS) [APFS Preboot] (Shared - 105 MB used) disk1s3 - Recovery (APFS) [Recovery] (Shared - 1.05 GB used) disk1s4 - VM (APFS) [APFS VM] (Shared - 1.07 GB used) disk1s5 - Macintosh HD - Data (APFS) [APFS Virtual drive] (Shared - 5.14 GB used) disk1s6 - Macintosh HD (APFS) (Shared - 11.09 GB used) Mounted Volumes: disk1s1 - Macintosh HD - Data 250.55 GB (Shared - 146.48 GB used, 85.48 GB free) APFS Mount point: /Volumes/Macintosh HD - Data disk1s3 - Recovery [Recovery] 250.55 GB (Shared - 1.05 GB used, 85.48 GB free) APFS Mount point: /Volumes/Recovery disk1s4 - VM [APFS VM] 250.55 GB (Shared - 1.07 GB used, 85.48 GB free) APFS Mount point: /private/var/vm disk1s5 - Macintosh HD - Data [APFS Virtual drive] 250.55 GB (Shared - 5.14 GB used, 85.64 GB available, 85.48 GB free) APFS Mount point: /System/Volumes/Data disk1s6 - Macintosh HD 250.55 GB (Shared - 11.09 GB used, 85.64 GB available, 85.48 GB free) APFS Mount point: / Read-only: Yes disk2s3 - F*****x 220 MB (216 MB used, 4 MB free) Mac OS Extended Disk Image Mount point: /Volumes/F*****x Owners enabled: No Read-only: Yes Network: Interface en1: Wi-Fi 802.11 a/b/g/n/ac Interface en6: Bluetooth PAN Interface bridge0: Thunderbolt Bridge System Software: macOS Catalina 10.15.6 (19G2021) Time since boot: About 16 hours Security: Gatekeeper: App Store and identified developers System Integrity Protection: Enabled Antivirus software: Apple System Launch Agents: [Not Loaded] 15 Apple tasks [Loaded] 167 Apple tasks [Running] 131 Apple tasks System Launch Daemons: [Not Loaded] 37 Apple tasks [Loaded] 167 Apple tasks [Running] 133 Apple tasks Backup: Time Machine Not Configured! Performance: System Load: 11.22 (1 min ago) 18.74 (5 min ago) 22.59 (15 min ago) Nominal I/O speed: 0.14 MB/s File system: 120.62 seconds (timed out) Write speed: 231 MB/s Read speed: 366 MB/s CPU Usage Snapshot: Type Overall System: 69 % User: 20 % Idle: 11 % Top Processes Snapshot by CPU: Process (count) CPU (Source - Location) EtreCheckPro 45.54 % (Etresoft, Inc.) WindowServer 36.74 % (Apple) system_profiler (2) 17.14 % (Apple) ps (5) 11.50 % (Apple) kernel_task 7.78 % (Apple) Top Processes Snapshot by Memory: Process (count) RAM usage (Source - Location) MTLCompilerService (25) 820 MB (Apple) system_profiler (2) 623 MB (Apple) plugin-container (5) 566 MB (Mozilla Corporation) EtreCheckPro 466 MB (Etresoft, Inc.) firefox 372 MB (Mozilla Corporation) Top Processes Snapshot by Network Use: Process Input / Output (Source - Location) mDNSResponder 2 MB / 766 KB (Apple) EmbeddedOSInstallService 157 KB / 215 KB (Apple) com.apple.WebKit.Networking 251 KB / 957 B (Apple) biometrickitd 45 KB / 11 KB (Apple) apsd 9 KB / 46 KB (Apple) Top Processes Snapshot by Energy Use: Process (count) Energy (0-100) (Source - Location) WindowServer 9 (Apple) system_profiler (2) 2 (Apple) bluetoothd 0 (Apple) trustd (4) 0 (Apple) launchd 0 (Apple) Virtual Memory Information: Physical RAM: 16 GB Free RAM: 4.23 GB Used RAM: 5.97 GB Cached files: 5.80 GB Available RAM: 10.03 GB Swap Used: 0 B Software Installs (past 30 days): Install Date Name (Version) 2020-08-15 Screen Mirror to TV & Device (2.2.1) 2020-08-15 MRTConfigData (1.64) 2020-08-15 XProtectPlistConfigData (2128) 2020-08-15 Gatekeeper Configuration Data (181) End of report