MBP mid 2012 very slow after High Sierra clean Installation

Question

EtreCheck version: 3.4.6 (460)Report generated 2017-11-17 11:30:07Download EtreCheck from https://etrecheck.comRuntime: 28:23Performance: PoorClick the [Lookup] links for more information from Apple Support Communities.Click the [Details] links for more information about that line.Problem: Computer is too slowHardware Information: ⓘ    MacBook Pro (13-inch, Mid 2012)     [Technical Specifications] - [User Guide] - [Warranty &amp; Service]    MacBook Pro - model: MacBookPro9,2    1 2.5 GHz Intel Core i5 (i5-3210M) CPU: 2-core    8 GB RAM Upgradeable - [Instructions]        BANK 0/DIMM0            4 GB DDR3 1600 MHz ok        BANK 1/DIMM0            4 GB DDR3 1600 MHz ok    Handoff/Airdrop2: supported    Wireless:  en2: 802.11 a/b/g/n    Battery: Health &#x3D; Normal - Cycle count &#x3D; 583Video Information: ⓘ    Intel HD Graphics 4000 - VRAM: 1536 MB        Color LCD 1280 x 800Disk Information: ⓘ    TOSHIBA MK5065GSXF disk0: (500.11 GB) (Rotational)    [Show SMART report]        EFI (disk0s1 - MS-DOS FAT32) &lt;not mounted&gt;  [EFI]: 210 MB         (disk0s2) &lt;not mounted&gt;  [CoreStorage Container]: 499.25 GB        (disk0s3) &lt;not mounted&gt;  [Recovery]: 650 MB    HL-DT-ST DVDRW  GS41N  ()USB Information: ⓘ     USB20Bus          hub_device             Apple Inc. FaceTime HD Camera (Built-in)      USB20Bus          hub_device              hub_device                 Apple Inc. Apple Internal Keyboard / Trackpad                 Apple Computer, Inc. IR Receiver                 Apple Inc. BRCM20702 Hub                     Apple Inc. Bluetooth USB Host Controller      USB30Bus Thunderbolt Information: ⓘ    Apple Inc. thunderbolt_busVirtual disks: ⓘ    Untitled (disk1 - Journaled HFS+) /  [Startup]: 498.88 GB (481.62 GB free)        Physical disk: disk0s2 499.25 GB OnlineSystem Software: ⓘ    macOS High Sierra  10.13 (17A405) - Time since boot: less than an hourGatekeeper: ⓘ    Mac App Store and identified developersSystem Launch Agents: ⓘ    [not loaded]    7 Apple tasks    [loaded]    191 Apple tasks    [running]    90 Apple tasksSystem Launch Daemons: ⓘ    [not loaded]    38 Apple tasks    [loaded]    186 Apple tasks    [running]    104 Apple tasksInternet Plug-ins: ⓘ    QuickTime Plugin: 7.7.3 (installed 2017-10-03)3rd Party Preference Panes: ⓘ    NoneTime Machine: ⓘ    Time Machine not configured!Top Processes by CPU: ⓘ         5%   WindowServer         2%   kernel_task         1%   mds         1%   mds_stores         0%   fontdTop Processes by Memory: ⓘ    736 MB    kernel_task    215 MB    com.apple.WebKit.WebContent    210 MB    com.apple.WebKit.WebContent    122 MB    com.apple.WebKit.WebContent    106 MB    mds_storesTop Processes by Network Use: ⓘ    Input     Output    Process name    26 KB     3 KB      mDNSResponder    11 KB     1 KB      netbiosd    4 KB      3 KB      apsd    5 KB      2 KB      com.apple.WebKit.Networking    0 B       64 B      SystemUIServerTop Processes by Energy Use: ⓘ      8.06 WindowServer      4.20 mds      2.72 mds_stores      0.16 mdworkerVirtual Memory Information: ⓘ    5.08 GB   Available RAM    1.03 GB   Free RAM    2.92 GB   Used RAM    4.05 GB   Cached files    0 B       Swap UsedDiagnostics Events (last 3 days for minor events): ⓘ    2017-11-17 10:27:44    Last shutdown cause: 3 - Hard shutdown    2017-11-17 09:36:23    WindowServer Crash [Open]        Cause:        Assertion failed: (((serviceCount &gt; 0) &amp;&amp; (serviceCount &#x3D;&#x3D; mpCount)) || (serviceCount &#x3D;&#x3D; 0) - Driver Error: 3 of 4 framebuffers were successfully opened), function CGXMappedDisplayStart, file /BuildRoot/Library/Caches/com.apple.xbs/Sources/CoreDisplay/CoreDisplay-79.7/Co reDisplay/IODisplay/MappedDisplay.cpp, line 4632.

John Galt · Answer

Back up your Mac if you have not done so already. To learn how to do that please read https://www.apple.com/support/backup/. To learn how to use Time Machine read Use Time Machine to back up or restore your Mac. The reason for creating a backup is that the symptoms you describe could be indicative of an impending hard disk drive failure, so securing your data is a primary concern.Then, shut down your Mac and restart it in "Safe Mode". To learn how to do that please read Use safe mode to isolate issues with your Mac - Apple Support. Compare how your Mac works in Safe Mode to how it has been, and describe your observations in a reply to this Discussion.Then, restart normally. If the same problem returns, please read the section If an issue doesn&#x27;t happen in safe mode for Apple&#x27;s recommended actions.Finally, you can temporarily create a new User Account, and log in to that account to determine if the problem also exists when logged in to that Account. To learn how to do that read How to test an issue in another user account on your Mac. When you are finished troubleshooting, you can remove the temporary User Account by following these instructions: Delete a user or group. Before removing it, confirm you don&#x27;t need any of the files you might have created in that Account.Let me know what you determine.