Which is the better approach? Adding memory to my aged iMac or upgrading to a new iMac?

Question

Which is the better approach? Adding memory to my aged iMac or upgrading to a new iMac?

I'm trying to decide if I would significantly benefit by adding more memory to the current iMac (it is upgradeable) or by upgrading to a new 21.5 iMac, 3.0 GHz, 8 GB memory, 1 TB storage (5400), especially given several articles detailing slow performance on the new iMac's. I've attached a current Etrecheck report. While it shows the presence of Malwarebytes, it is not running in "real time" mode. When I do run in Real Time the measured performance drops to "Below Average". Hopefully the report helps. I don't want to spend $1.5K to $2K only to discover the performance gain is disappointing. Any guidance is appreciated. Thank you.

EtreCheck version: 3.4.6 (460)

Report generated 2017-12-11 15:48:20

Download EtreCheck from https://etrecheck.com

Runtime: 4:44

Performance: Good

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

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

Problem: No problem - just checking

Hardware Information: ⓘ

iMac (21.5-inch, Mid 2010)

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

iMac - model: iMac11,2

1 3.06 GHz Intel Core i3 (i3) CPU: 2-core

4 GB RAM Upgradeable - [Instructions]

BANK 0/DIMM0

Empty

BANK 1/DIMM0

Empty

BANK 0/DIMM1

2 GB DDR3 1333 MHz ok

BANK 1/DIMM1

2 GB DDR3 1333 MHz ok

Handoff/Airdrop2: not supported

Wireless: en1: 802.11 a/b/g/n

iCloud Quota: 43.51 GB available

Video Information: ⓘ

ATI Radeon HD 4670 - VRAM: 256 MB

iMac 1920 x 1080

Disk Information: ⓘ

SAMSUNG HD502HJ disk0: (500.11 GB) (Rotational)

[Show SMART report]

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

Macintosh HD (disk0s2 - Journaled HFS+) / [Startup]: 499.25 GB (339.95 GB free)

Recovery HD (disk0s3 - HFS+) <not mounted> [Recovery]: 650 MB

OPTIARC DVD RW AD-5680H ()

USB Information: ⓘ

USB20Bus

hub_device

Western Digital My Passport 071A

My Passport 071A disk1: (500.08 GB)

(disk1s1) <not mounted> [partition_map]: 32 KB

iMac Backup Disk (disk1s3 - Journaled HFS+) /Volumes/iMac Backup Disk : 499.95 GB (281.42 GB free)

Apple Internal Memory Card Reader

Apple Inc. BRCM2046 Hub

Apple Inc. Bluetooth USB Host Controller

USB20Bus

hub_device

Apple Computer, Inc. IR Receiver

Apple Inc. Built-in iSight

System Software: ⓘ

macOS High Sierra 10.13.2 (17C88) - Time since boot: about one day

Gatekeeper: ⓘ

Mac App Store and identified developers

Kernel Extensions: ⓘ

/Library/Extensions

[loaded] com.malwarebytes.mbam.rtprotection (3.1 - SDK 10.12) [Lookup]

System Launch Agents: ⓘ

[not loaded] 9 Apple tasks

[loaded] 168 Apple tasks

[running] 113 Apple tasks

System Launch Daemons: ⓘ

[failed] com.apple.updateEFIDesktopPicture-apfs.plist (Apple, Inc. - installed 2017-12-01)

[not loaded] 36 Apple tasks

[loaded] 182 Apple tasks

[running] 113 Apple tasks

Launch Agents: ⓘ

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (Adobe Systems, Inc. - installed 2017-01-17) [Lookup]

[running] com.epson.Epson_Low_Ink_Reminder.launcher.plist (EPSON - installed 2015-09-06) [Lookup]

[running] com.epson.ecrp.launcher.plist (? 9f44d54 389bd108 - installed 2015-08-07) [Lookup]

[loaded] com.epson.esua.launcher.plist (Seiko Epson Corporation - installed 2017-06-28) [Lookup]

[running] com.epson.eventmanager.agent.plist (Seiko Epson Corporation - installed 2017-06-28) [Lookup]

[running] com.epson.scannermonitor.plist (Seiko Epson Corporation - installed 2017-06-28) [Lookup]

[loaded] com.google.keystone.agent.plist (Google, Inc. - installed 2017-09-27) [Lookup]

[running] com.malwarebytes.mbam.frontend.agent.plist (Malwarebytes Corporation - installed 2017-12-07) [Lookup]

[loaded] com.oracle.java.Java-Updater.plist (? 1e952949 72ac4dde - installed 2017-11-10) [Lookup]

[running] com.rosettastone.rosettastonedaemon.plist (? fb2f5604 e41edcaf - installed 2011-04-01) [Lookup]

Launch Daemons: ⓘ

[loaded] com.adobe.ARMDC.Communicator.plist (Adobe Systems, Inc. - installed 2017-01-17) [Lookup]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist (Adobe Systems, Inc. - installed 2017-01-17) [Lookup]

[loaded] com.adobe.fpsaud.plist (? 2afb3af7 defea098 - installed 2017-10-25) [Lookup]

[loaded] com.google.keystone.daemon.plist (Google, Inc. - installed 2017-10-13) [Lookup]

[running] com.malwarebytes.mbam.rtprotection.daemon.plist (Malwarebytes Corporation - installed 2017-12-07) [Lookup]

[running] com.malwarebytes.mbam.settings.daemon.plist (Malwarebytes Corporation - installed 2017-12-07) [Lookup]

[loaded] com.oracle.java.Helper-Tool.plist (Shell Script e3fefdd2 - installed 2017-09-05) [Lookup]

User Launch Agents: ⓘ

[running] com.akamai.single-user-client.plist (? 4e8c16bb f4f704a9 - installed 2017-09-25) [Lookup]

[loaded] ltcm.plist (? 65cf0b8b 66c8b318 - installed 2017-02-26) [Lookup]

User Login Items: ⓘ

iTunesHelper Application (Apple, Inc. - installed 2017-12-07)

(/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Photo Stream URL SMLoginItem - Hidden (Apple, Inc. - installed 2015-03-19)

(/Applications/iPhoto.app/Contents/Library/LoginItems/PhotoStreamAgent.app)

Internet Plug-ins: ⓘ

Flip4Mac WMV Plugin: 2.3.8.1 (installed 2011-01-13) [Lookup]

FlashPlayer-10.6: 27.0.0.187 (installed 2017-11-14) [Lookup]

QuickTime Plugin: 7.7.3 (installed 2017-12-08)

AdobePDFViewerNPAPI: 17.012.20098 (installed 2017-12-01) [Lookup]

AdobePDFViewer: 18.009.20050 (installed 2017-12-01) [Lookup]

Flash Player: 27.0.0.187 (installed 2017-11-14) [Lookup]

JavaAppletPlugin: Java 8 Update 151 build 12 (installed 2017-11-10) Check version

NPVirtools: 4.0 (installed 2010-06-11) [Lookup]

Silverlight: 5.1.30514.0 (installed 2014-10-04) [Lookup]

iPhotoPhotocast: 7.0 (installed 2013-04-23)

Safari Extensions: ⓘ

[enabled] AdBlock - BetaFish, Inc. - https://getadblock.com (installed 2015-09-26)

3rd Party Preference Panes: ⓘ

Akamai NetSession Preferences (installed 2017-09-12) [Lookup]

Flash Player (installed 2017-10-25) [Lookup]

Flip4Mac WMV (installed 2011-01-13) [Lookup]

Java (installed 2017-11-10) [Lookup]

Time Machine: ⓘ

Skip System Files: NO

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

Macintosh HD: Disk size: 499.25 GB Disk used: 159.30 GB

Destinations:

iMac Backup Disk [Local]

Total size: 499.95 GB

Total number of backups: 66

Oldest backup: 5/23/17, 5:37 PM

Last backup: 12/11/17, 3:31 PM

Size of backup disk: Adequate

Backup size 499.95 GB > (Disk used 159.30 GB X 3)

Top Processes by CPU: ⓘ

3% WindowServer

1% kernel_task

0% opendirectoryd

0% ps

0% nsurlstoraged

Top Processes by Memory: ⓘ

543 MB kernel_task

305 MB Safari

218 MB com.apple.WebKit.WebContent

149 MB com.apple.WebKit.WebContent

145 MB com.apple.WebKit.WebContent

Top Processes by Network Use: ⓘ

Input Output Process name

3 MB 210 KB mDNSResponder

2 MB 386 KB Mail

50 KB 38 KB apsd

44 KB 7 KB netbiosd

7 KB 2 KB cloudd

Top Processes by Energy Use: ⓘ

5.02 WindowServer

0.90 opendirectoryd

0.56 netsession_mac

0.54 EEventManager

Virtual Memory Information: ⓘ

1.17 GB Available RAM

42 MB Free RAM

2.83 GB Used RAM

1.13 GB Cached files

180 MB Swap Used

Software installs (last 30 days): ⓘ

Adobe Flash Player: (installed 2017-11-14)

Adobe Acrobat Reader DC (18.009.20044): (installed 2017-11-15)

Home Inventory: 3.7.2 (installed 2017-11-21)

Home Inventory: 3.7.3 (installed 2017-11-24)

Adobe Acrobat Reader DC (18.009.20050): (installed 2017-12-01)

Malwarebytes for Mac: (installed 2017-12-07)

Install information may not be complete.

Diagnostics Events (last 3 days for minor events): ⓘ

2017-12-10 11:44:40 Last shutdown cause: 0 - Power loss