External Hard Drive incredibly slow after High Sierra

So why doesn't Apple make this more clear before it is done? Also, I really don't think that my HDD being APFS is the problem - it was terrible before I did this, and has slightly improved since.

Also, it's not recommended for HDD's? Looks like SSD's also as my computer was lightning fast and now is a dog. It takes forever to start up, my keyboard wont work for a bit either until everything catches up. I really regret this.

I haven't been just sitting on this site complaining, I have tried things such as First Aid not the HDD, everything was fine. I've tried booting into safe mode and the HDD is still slow. I've been keeping an eye on Time Capsule which has been trying to back up for the past 20 minutes, it's only backed up 50MB of 8GB - it's not backing up the HDD either so it's obviously also running slow.

Total mess, I wont upgrade next year that will sort my problems. Cannot understand why this is just me?

Heres the report, I have removed/cleaned up the things in red that was prompted. As you can see, highest CPU usage from iconserviceagent

EtreCheck version: 3.4.5 (455)

Report generated 2017-09-26 20:25:00

Download EtreCheck from https://etrecheck.com

Runtime: 1:54

Performance: Excellent

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Click the [Remove/Report] links to remove adware or update the whitelist of legitimate software.

Click the [Clean up] link to delete unused files.

Problem: Computer is too slow

Description:

External HDD extremely slow loading contents

Hardware Information:ⓘ

iMac (21.5-inch, Late 2013)

[Technical Specifications] - [User Guide] - [Warranty & Service]

iMac - model: iMac14,1

1 2.7 GHz Intel Core i5 (i5-4570R) CPU: 4-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: en1: 802.11 a/b/g/n/ac

iCloud Quota: 39.65 GB available

Video Information:ⓘ

Intel Iris Pro - VRAM: 1536 MB

iMac 1920 x 1080

Disk Information:ⓘ

KINGSTON SV300S37A240G disk0: (240.06 GB) (Solid State - TRIM: No)

[Show SMART report]

EFI (disk0s1 - MS-DOS FAT32) <not mounted> [EFI]: 210 MB

(disk0s2) <not mounted> [APFS Container]: 239.85 GB

USB Information:ⓘ

USB30Bus

Seagate Expansion Desk

Expansion Desk disk2: (3 TB)

EFI (disk2s1 - MS-DOS FAT32) <not mounted> [EFI]: 210 MB

(disk2s2) <not mounted> [APFS Container]: 3.00 TB

Apple Inc. BRCM20702 Hub

Apple Inc. Bluetooth USB Host Controller

Apple Inc. FaceTime HD Camera (Built-in)

Thunderbolt Information:ⓘ

Apple Inc. thunderbolt_bus

Virtual disks:ⓘ

My SSD (disk1s1 - APFS) / [Startup]: 239.85 GB (166.22 GB free)

Physical disk: disk0s2 239.85 GB (166.22 GB free)

(disk1s2) <not mounted> [Preboot]: 239.85 GB

Physical disk: disk0s2 239.85 GB

(disk1s3) <not mounted> [Recovery]: 239.85 GB

Physical disk: disk0s2 239.85 GB

(disk1s4) /private/var/vm [VM]: 239.85 GB

Physical disk: disk0s2 239.85 GB

SEAGATE (disk3s1 - APFS) /Volumes/SEAGATE : 3.00 TB (1.17 TB free)

Physical disk: disk2s2 3.00 TB (1.17 TB free)

System Software:ⓘ

macOS High Sierra 10.13 (17A365) - Time since boot: less than an hour

Gatekeeper:ⓘ

Mac App Store and identified developers

Possible adware:ⓘ

Adware: /Library/LaunchDaemons/com.MyUpdater.agent.plist

One possible adware file found. [Remove/Report]

Clean up:ⓘ

/Library/LaunchDaemons/com.MyUpdater.agent.plist

/Applications/MyUpdater/MyUpdater -guid 22164498041898502 -source nwt-1634

Executable not found!

~/Library/LaunchAgents/com.ea.origin.WebHelper.plist

/Applications/Origin.app/Contents/Library/LaunchServices/com.ea.origin.WebHelpe r

Executable not found!

2 orphan files found. [Clean up]

System Launch Agents:ⓘ

[not loaded] 9 Apple tasks

[loaded] 179 Apple tasks

[running] 99 Apple tasks

[killed] One Apple task

one process killed due to insufficient RAM

System Launch Daemons:ⓘ

[not loaded] 37 Apple tasks

[loaded] 188 Apple tasks

[running] 100 Apple tasks

[killed] 4 Apple tasks

4 processes killed due to insufficient RAM

Launch Agents:ⓘ

[loaded] com.oracle.java.Java-Updater.plist (? 4737623b 72ac4dde - installed 2017-08-23) [Lookup]

Launch Daemons:ⓘ

[failed] com.MyUpdater.agent.plist (? 281a5689 0 - installed 2016-08-26) Adware! [Remove/Report]

[loaded] com.adobe.fpsaud.plist (? 2afb3af7 eb6bee8f - installed 2017-08-29) [Lookup]

[not loaded] com.apple.installer.cleanupinstaller.plist (? 1963bf56 0 - installed 2017-09-26)

[loaded] com.apple.installer.osmessagetracing.plist (Apple, Inc. - installed 2017-09-21)

[loaded] com.bombich.ccchelper.plist (Bombich Software, Inc. - installed 2016-11-01) [Lookup]

[running] com.cleverfiles.cfbackd.plist (Justin Johnson - installed 2016-05-31) [Lookup]

[loaded] com.ea.origin.ESHelper.plist (EA Swiss Sarl - installed 2017-09-25) [Lookup]

[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-07-22) [Lookup]

[running] org.serviio.server.plist (Shell Script 16e32f40 - installed 2017-09-21)

User Launch Agents:ⓘ

[loaded] com.ea.origin.WebHelper.plist (? 89771325 0 - installed 2017-09-25) [Lookup] - /Applications/Origin.app/Contents/Library/LaunchServices/com.ea.origin.WebHelpe r: Executable not found!

User Login Items:ⓘ

Mail Application - Hidden

(/Applications/Mail.app)

Internet Plug-ins:ⓘ

FlashPlayer-10.6: 27.0.0.130 (installed 2017-09-12) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-09-21)

Flash Player: 27.0.0.130 (installed 2017-09-12) [Lookup]

JavaAppletPlugin: Java 8 Update 144 build 01 (installed 2017-08-23) Check version

PepperFlashPlayer: 27.0.0.130 (installed 2017-09-12) [Lookup]

Safari Extensions:ⓘ

[enabled] AdBlock - BetaFish, Inc. - https://getadblock.com (installed 2017-09-25)

[not loaded] Adblock Plus - Eyeo GmbH - https://adblockplus.org/ (installed 2016-12-22)

3rd Party Preference Panes:ⓘ

Flash Player (installed 2017-08-29) [Lookup]

Java (installed 2017-08-23) [Lookup]

Time Machine:ⓘ

Skip System Files: NO

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

My SSD: Disk size: 239.85 GB Disk used: 73.62 GB

Destinations:

Time Capsule [Network]

Total size: 2.00 TB

Total number of backups: 3

Oldest backup: 26/09/2017, 17:43

Last backup: 26/09/2017, 19:27

Size of backup disk: Excellent

Backup size 2.00 TB > (Disk size 239.85 GB X 3)

Top Processes by CPU:ⓘ

57% iconservicesagent

35% kernel_task

4% mdworker

4% WindowServer

3% mdworker

Top Processes by Memory:ⓘ

1.39 GB iconservicesagent

705 MB kernel_task

433 MB Safari

148 MB com.apple.WebKit.WebContent

95 MB java

Top Processes by Network Use:ⓘ

Input Output Process name

4 MB 44 KB com.apple.WebKit.Networking

43 KB 6 KB Mail

29 KB 0 B java

19 KB 8 KB mDNSResponder

8 KB 11 KB apsd

Top Processes by Energy Use:ⓘ

21.92 iconservicesagent

5.64 WindowServer

0.54 java

0.50 corespotlightd

Virtual Memory Information:ⓘ

4.70 GB Available RAM

1.49 GB Free RAM

3.30 GB Used RAM

3.22 GB Cached files

21 MB Swap Used

Software installs:ⓘ

OptimUSB: 7.0 (installed 2017-09-01)

Adobe Flash Player: (installed 2017-09-12)

Adobe Pepper Flash Player: (installed 2017-09-12)

OptimUSB: 7.1 (installed 2017-09-13)

The Unarchiver: 3.11.2 (installed 2017-09-13)

OptimUSB: 7.2 (installed 2017-09-17)

The Unarchiver: 3.11.3 (installed 2017-09-17)

Bitdefender Virus Scanner: 3.9 (installed 2017-09-19)

MyDrive Connect: (installed 2017-09-25)

Bitdefender Virus Scanner: 3.9 (installed 2017-09-26)

Install information may not be complete.

Diagnostics Information:ⓘ

2017-09-26 14:52:00 Finder.app Hang [Open]

Well it might be a very big coincidence if my HDD is failing, as it was 100% fine right before I installed High Sierra yesterday. It also slows down my computer whilst it tries loading files, which then freezes my computer even if I don't have the window open on the HDD. As I said, once I turn the HDD off everything is fine.

If I try opening a video, I get a window with "verifying" in it, after about 30 seconds the video finally opens. It happens sometimes, sometimes not. Once it's verified a video, it wont verify that video again until the HDD is restarted.

Copying a file off the HDD to my SSD also is unbelievable, 500MB takes around 30 mins.

I restarted my iMac around 20 mins ago, the HDD is working fine in some areas now they have loaded, but if I try opening folders I haven't opened yet chaos happens again. I can't understand this

I really do not think it is the HDD failing. It's not even a year old, and I do not have any other HDD to try anything else.

In reply to HDD's fail after a lot of activity, how has there been major activity on it? The computer upgraded, not the HDD.

Thats a joy, Time Capsule filled up yesterday, for some reason unknown to me I decided to wipe it and order a new HDD which comes Friday. Thats whats concerning me now as I do not have a backup so if something goes wrong im done for.

What is the best course of action? Hopefully Apple will have a fix for this?

I've just tried copying a file from the HDD to the iMac, it was very fast this time. Also, moving it back on was also fast. It's still incredibly slow to load folder contents I haven't opened yet though, and im sure once I restart the HDD it will have to catch up all over again. Nightmare.

Just tried opening another folder, I got the spinning wheel and it froze, had to force quit Finder as it said "not responding"

This is really getting on my nerves, and I'm worrying that leaving the HDD on + connected was a bad idea when updating, but surely this shouldn't of affected it?