Slow internet through ethernet, extremely slow suddenly through wifi

I have an old Macbook Pro. And I've successfully upgraded it thanks to free advice from these forums (after paying "experts" to help to no avail.

So it has a solid state drive in it, replaced battery, and also the local Mac laptop shop soldered the wifi card about 6 months ago... after wifi stopped working. I know the whole laptop is overdue for replacement but I am a penniless English teacher living in Prague. HELPPPPP!

The issue now is 2-fold:

1. Internet speed through the ethernet – 30% slower than the a test done in parallel on my iphone 5.

2. Wifi internet speed today has dropped to 10% of the speed through the iphone 5.

I understand that the wifi card maybe knackered in. That's one thing. But why is the ethernet connection also rather compromised?

Any clever person out there who can help solve this?

_____________

THE GRITTY DETAILS....

Browser - Google Chrome - Version 56.0.2924.87 (64-bit)

IOS - Sierra High - upgraded 7 days ago.

router - Netis WF2419

A. systems data

Hardware - ethernet card

Broadcom 57765-B0:

Name: ethernet

Type: Ethernet Controller

Bus: PCI

Vendor ID: 0x14e4

Device ID: 0x16b4

Subsystem Vendor ID: 0x14e4

Subsystem ID: 0x16b4

Revision ID: 0x0010

Link Width: x1

BSD name: en0

Kext name: AppleBCM5701Ethernet.kext

Firmware version: 57765-a1.54

Location: /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleBCM570 1Ethernet.kext

mDNS offload capable: 10:9a:dd:6c:08:ca

Version: 10.3.1

Network - WIFI

Software Versions:

CoreWLAN: 13.0 (1339)

CoreWLANKit: 13.0 (1339)

Menu Extra: 13.0 (1345)

System Information: 12.0 (1300.1)

IO80211 Family: 12.0 (1200.12.2)

Diagnostics: 1.0 (805)

AirPort Utility: 6.3.8 (638.5)

Interfaces:

en1:

Card Type: AirPort Extreme (0x14E4, 0xD6)

Firmware Version: Broadcom BCM43xx 1.0 (5.106.98.102.30)

MAC Address: e0:f8:47:1a:5e:50

Locale: ETSI

Country Code: CZ

Supported PHY Modes: 802.11 a/b/g/n

Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140

Wake On Wireless: Supported

AirDrop: Supported

Status: Off

B. Etrecheck report

EtreCheck version: 2.1.8 (121)

Report generated 1 February 2018 at 17:47:07 CET

Download EtreCheck from http://etresoft.com/etrecheck

Click the [Click for support] links for help with non-Apple products.

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

Hardware Information: ℹ

MacBook Pro (13-inch, Early 2011) (Technical Specifications)

MacBook Pro - model: MacBookPro8,1

1 2.3 GHz Intel Core i5 CPU: 2-core

4 GB RAM Upgradeable

BANK 0/DIMM0

2 GB DDR3 1333 MHz ok

BANK 1/DIMM0

2 GB DDR3 1333 MHz ok

Bluetooth: Old - Handoff/Airdrop2 not supported

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

Battery Health: Normal - Cycle count 271

Video Information: ℹ

Intel HD Graphics 3000

Color LCD 1280 x 800

System Software: ℹ

macOS 10.13.2 (17C88) - Time since boot: 1:39:58

Disk Information: ℹ

SanDisk SD8SB8U512G1122 disk0 : (512.11 GB)

EFI (disk0s1) <not mounted> : 210 MB

disk0s2 (disk0s2) <not mounted> : 511.90 GB

MATSHITADVD-R UJ-898

USB Information: ℹ

Apple Inc. iPhone

Apple Computer, Inc. IR Receiver

Apple Inc. FaceTime HD Camera (Built-in)

Apple Inc. Apple Internal Keyboard / Trackpad

Apple Inc. BRCM2070 Hub

Apple Inc. Bluetooth USB Host Controller

Thunderbolt Information: ℹ

Apple Inc. thunderbolt_bus

Gatekeeper: ℹ

Mac App Store and identified developers

Kernel Extensions: ℹ

/Applications/MacX Video Converter Pro.app

[not loaded] com.macxdvd.driver.goodSysAudioCapture (1 - SDK 10.10) [Click for support]

/Applications/iSkysoft iMedia Converter Deluxe.app

[not loaded] com.Perfect.Driver.SystemAudioRecorder (1.0.0 - SDK 10.6) [Click for support]

/Applications/zoom.us.app

[not loaded] zoom.us.ZoomAudioDevice (1.1 - SDK 10.8) [Click for support]

/Library/Extensions

[not loaded] com.jabra.usbdevice (1.0.0 - SDK 10.13) [Click for support]

[loaded] com.malwarebytes.mbam.rtprotection (3.1.1 - SDK 10.12) [Click for support]

/System/Library/Extensions

[not loaded] com.zte.driver.cdc_usb_bus (1.0.0d1) [Click for support]

Problem System Launch Agents: ℹ

[loaded] com.openssh.ssh-agent.plist [Click for support]

Problem System Launch Daemons: ℹ

[not loaded] org.ntp.ntpd-legacy.plist [Click for support]

Launch Agents: ℹ

[running] com.jabra.avaya3.plist [Click for support]

[loaded] com.google.keystone.agent.plist [Click for support]

[running] com.jabra.sametime.plist [Click for support]

[running] com.jabra.avaya.plist [Click for support]

[running] com.malwarebytes.mbam.frontend.agent.plist [Click for support]

[loaded] com.oracle.java.Java-Updater.plist [Click for support]

[running] com.jabra.bria.plist [Click for support]

[not loaded] com.adobe.AAM.Updater-1.0.plist [Click for support]

[not loaded] C1765printhelper.plist [Click for support]

[running] com.jabra.skype.plist [Click for support]

[failed] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a...plist [Click for support]

[running] com.jabra.appservice.plist [Click for support]

Launch Daemons: ℹ

[running] com.malwarebytes.mbam.settings.daemon.plist [Click for support]

[loaded] com.adobe.ARMDC.SMJobBlessHelper.plist [Click for support]

[running] com.malwarebytes.mbam.rtprotection.daemon.plist [Click for support]

[loaded] com.adobe.ARMDC.Communicator.plist [Click for support]

[loaded] com.malwarebytes.HelperTool.plist [Click for support]

[failed] com.prey.agent.plist [Click for support] [Click for details]

[loaded] com.adobe.fpsaud.plist [Click for support]

[loaded] com.oracle.java.Helper-Tool.plist [Click for support]

[loaded] com.bombich.ccchelper.plist [Click for support]

[loaded] com.microsoft.office.licensing.helper.plist [Click for support]

[not loaded] PPPMonitord.plist [Click for support]

User Launch Agents: ℹ

[failed] com.adobe.ARM.[...].plist [Click for support] [Click for details]

[loaded] com.adobe.AAM.Updater-1.0.plist [Click for support]

[failed] com.facebook.videochat.[redacted].plist [Click for support]

[loaded] com.skype.skype.shareagent.plist [Click for support]

[loaded] com.dropbox.DropboxMacUpdate.agent.plist [Click for support]

[loaded] com.spotify.webhelper.plist [Click for support]

User Login Items: ℹ

Upwork UNKNOWN (missing value)

Spotify UNKNOWN (missing value)

Dropbox Application (/Applications/Dropbox.app)

SpeechSynthesisServer Application (/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks /SpeechSynthesis.framework/Versions/A/SpeechSynthesisServer.app)

Internet Plug-ins: ℹ

o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]

AdobePDFViewerNPAPI: Version: 17.012.20098 - SDK 10.11 [Click for support]

FlashPlayer-10.6: Version: 28.0.0.137 - SDK 10.12 [Click for support]

Silverlight: Version: 5.1.40416.0 - SDK 10.6 [Click for support]

QuickTime Plugin: Version: 7.7.3

iPhotoPhotocast: Version: 7.0 - SDK 10.7

Flash Player: Version: 28.0.0.137 - SDK 10.12 [Click for support]

SharePointBrowserPlugin: Version: 14.6.7 - SDK 10.6 [Click for support]

AdobePDFViewer: Version: 18.009.20050 - SDK 10.11 [Click for support]

PepperFlashPlayer: Version: 28.0.0.137 - SDK 10.12 [Click for support]

googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]

JavaAppletPlugin: Version: Java 8 Update 144 build 01 Check version

User internet Plug-ins: ℹ

CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 [Click for support]

ZoomUsPlugIn: Version: 4.0.36452.0616 - SDK 10.11 [Click for support]

WebEx64: Version: 1.1.0 - SDK 10.10 [Click for support]

3rd Party Preference Panes: ℹ

Flash Player [Click for support]

Jabra Suite for Mac [Click for support]

Java [Click for support]

Time Machine: ℹ

Skip System Files: NO

Mobile backups: ON

Auto backup: YES

Volumes being backed up:

Destinations:

Time Machine Backups [Local]

Total size: 999.86 GB

Total number of backups: 26

Oldest backup: 2014-08-09 12:12:03 +0000

Last backup: 2018-01-21 08:31:43 +0000

Size of backup disk: Excellent

Backup size 999.86 GB > (Disk size 0 B X 3)

Top Processes by CPU: ℹ

84% RTProtectionDaemon

16% mds

15% Google Chrome

7% WindowServer

5% coreaudiod

Top Processes by Memory: ℹ

189 MB Google Chrome

86 MB RTProtectionDaemon

86 MB mds_stores

64 MB Microsoft Excel

56 MB Spotlight

Virtual Memory Information: ℹ

73 MB Free RAM

1.39 GB Active RAM

1.33 GB Inactive RAM

1.31 GB Wired RAM

105.75 GB Page-ins

143 MB Page-outs

Diagnostics Information: ℹ

Feb 1, 2018, 04:07:33 PM /Users/[redacted]/Library/Logs/DiagnosticReports/C1765printhelper_2018-02-01-16 0733_[redacted].crash

Feb 1, 2018, 04:06:03 PM Self test - passed

Feb 1, 2018, 12:15:46 PM /Library/Logs/DiagnosticReports/fud_2018-02-01-121546_[redacted].crash

Jan 30, 2018, 12:21:22 PM /Users/[redacted]/Library/Logs/DiagnosticReports/QuickLookUIService_2018-01-30- 122122_[redacted].crash

Jan 29, 2018, 08:56:37 PM /Library/Logs/DiagnosticReports/Photos_2018-01-29-205637_[redacted].hang

Jan 29, 2018, 08:13:40 PM /Library/Logs/DiagnosticReports/Malwarebytes XPC Service_2018-01-29-201340_[redacted].cpu_resource.diag [Click for details]