Internet Speed with MacBook Pro

try this experiment:

Restart in Safe mode (hold shift at Startup). Your Mac starts, does a five minute disk repair as it starts up, then loads only a minimal set of Apple-only extensions, not including graphics acceleration. Screen updates will be wonky and slow, but ultimately correct. No third-party extensions are loaded.

Run Internet speed test. The numbers you get here would be what you could achieve if there were no "junk" slowing your MacOS down. I would expect them to be similar to, but not identical to, the numbers you got running Windows.

If you are seeing slowness on Ethernet, you likely have something slowing down your computer. To make progress, download and run this little "discovery" Utility, designed to collect performance and software information about your computer. It fixes nothing. It generates a report that can be posted to a reply in the forums, and readers can help you analyze what is happening.

Using EtreCheck to Troubleshoot Potential… - Apple Community

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You have multiple different security services loaded. when you do this, each thing one security program does looks like a Malware attack to each of the others. Your Mac slows dramatically, and you get NOTHING done. Remove them ALL.

Nothing beyond what already ships in the box is required for your premium-quality Macintosh computer.

Effective defenses against malware and ot… - Apple Community

You have a highly-modified Hosts file. this is sometimes done tofaclitate Web site development, but can also be a sign of problems.

You have a Bit torrent loaded. the part Users forget is that they promise to share their resources and software back to the other users of the Torrent, draining their computer's resources. This should be removed.

You are using an unnecessary VNC. Unless you need it to connect to a Corporate network, a VNC adds complexity and slows your connection for NO increase in protection. Sounds cool, does nothing for you. Your Wi-Fi is encrypted already, your Home network is proteced by the built-in firewall and N.A.T. and web sites all use encryption. If you need more protection than that, use Tor Browser, used for folks in the Federal Witness Protection Program.

More than one antivirus app - This machine has multiple antivirus apps installed.

Antivirus software: Apple, One Periodic, and CleanMyMac

also:

[Running] App Cleaner Helper (Sergiy Savenko - installed 2020-05-25)

Modern Login Item

/Applications/App Cleaner.app/Contents/Library/LoginItems/App Cleaner Helper.app

You have a remarkable amount of "junk" added. "Junk" in this context is stuff that may be perfectly good, but you do to need out and underfoot every day, like stuff that is (or should be) in the Attic.

This is punishing performance. Typical CPU Usage when idle is under 2 percent system and under 2 percent User. Yours are MUCH larger:

CPU Usage Snapshot:

Type Overall

System: 13 %

User: 25 %

Idle: 63 %

As for Network use, Dropbox is your top network user. It is a known "Bad-Actor". Since it is not MacOS native, it does not know how to use MacOS data structures to find recently changed folders. When allowed to run as a Startup Item, it runs all the time. It is worse than anti-virus software, because it not only scans all your files non-stop, it [inexcusably] scans the copies on the Internet non-stop. The solution of this bad boy (if you insist on using it) is to set it to run only on demand -- when you have something you want synchronized.

Etrecheck 'excellent' rating is for the execution SPEED of Etrecheck, NOTHING MORE. It is most influenced by Disk I/O speed. There is no problem with your disk I/O speed.

Your complaint of Internet speed is a valid one, and some of the causes are the things I have listed.

But you still have a very large collection of things that could be continuing to slow down your computer in general, and these will contribute to slow internet connection.

if you run Windows without Dropbox and all the other "Junk", you can see how fast it could be once you clean up the "junk" you have installed in MacOS!

I don't think a new user would solve this.

But yes if you have your backup in place and is upto date, Please go ahead and perform a clean install.

If you don't like to do a clean install, you may need to manage all those apps that depends on internet manually tweaking or setting to minimise the usage.

You MUST have at least one, and preferably TWO backups before you can do a clean install, because the Clean part of it ERASEs all your files off the drive, and you can only copy them back from a Trusted Backup.

Please boot in safe mode and check your speed test with RJ-45 (ethernet) connected.