Low LAN and 5GHz WIFI speeds from RAXE500 Router?

As others have pointed out, in a case like that i would focus more on the Ethernet adapter of the laptop.
Typically, speed issues on the NIC side of things can run into issues with some firewall software, as well as issues with network management applications. For example, a number of early versions of the "Killer" network management software would cause throughput issues.

If possible also try running a speed test using your web browser rather than the speed test app. https://www.speedtest.net/

Some management software will limit the performance of some applications, especially the ones that focus on improving multiplayer gaming experience.

one way to rule out some of the issues is to use a LAN speed test such as iperf https://iperf.fr/ and then benchmark the speed between 2 PCs on the same LAN. In the case of a router with only 1 2.5GbE port, something like speed between 1 802.11ax client (which can do around 1.8Gbps on real world throughput on the RAXE500 for both the 5GHz and 6GHz band), and for the other end point, the PC using the 2.5GbE port, and if speeds are good with that setup then you know the NIC is good, and the issue may be some software causing issues with non-local traffic.
If the NIC does weird behavior like starting fast and then suddenly slowing down, then there is a potential for another rare type of issue.
On rare occasion it can be the NIC hardware, though I only ever saw it on an add-in card that someone had on a slim PC with poor airflow, where the RTL8125 chip was overheating (it slows down significantly when overheating). The issue in that case was that the chip had no heatsink, and while the chip doesn't require one be default, the expectation is that the PCB will cool the chip via the ground plane. Though some extremely cheap implementations that try to minimize PCB cost as much as possible, thus when someone sees a 2.5GbE adapter for $3-$4 including free shipping on a place like aliexpress (they really should be getting the $6-$7 ones that have a heatsink), they may end up with reduced performance if the card does not have direct airflow. In that case, I fixed it using some thermal adhesive to attach a small heatsink to the chip.
Anyway that shouldn't be an issue for a laptop since the device makers should have their thermal management done properly and on a multi-layer PCB, pretty much all modern 2.5GbE controllers should be fine with just sinking their heat into the PCB.

Sorry for the delay, but life has a way of distracting at times. 

I wanted to come back and let you all know I finally did resolve this issue...at least to the point of getting 900+ mps back to my laptop. I ultimately decided to completely uninstall BitDefender and disable Armor on my router. So I'm flying with just Windows anti-virus and firewall protection. I used to use the free version of Avast for years. But this is ultimately what restored the higher 900+ mps to my laptop. I guess just disabling BitDefender, which I'd tried a couple times previously, does not stop it from throttling the bandwidth?? But as you can see from the speed tests, my laptop is back to 900+mps

If the software needs to inspect the contents of each packet in real time, then often due to the nature of how the traffic is handled, it will use a single CPU core/ thread. Do to how thread scheduling is handled, often the only way to spot such bottlenecks, is to use an application such as process explorer, and look for threads that are using 1 thread worth of CPU time, basically do 100 divided by the number of threads the CPU has then see which threads are using that percentage of CPU time.

This can also be used to spot CPU bottlenecks for games where you may see frame time issues or poor GPU utilization and an overall low CPU usage. In many cases such behaviors are caused by a single thread within the application that cannot be handled asynchronously.

Anyway, if an AV application is causing a slowdown, then odds are likely that it is running into a single thread bottleneck.

With that in mind, for the router itself, the Armor service can still allow the router to hit 2-2.3Gbps over the 2.5GbE port for a TCP connection, without encountering a single thread bottleneck, though armor doesn't seem to fully analyze the contents of a packet, and instead focuses more on the L7 aspects, as well as more basic behaviors of the traffic to spot issues.

Razor512 I may re-enable Armor then and see how it goes? Not sure I can get any better than 900+mps outta my laptop without upgrading the LAN card? As it's 3 years old I may instead just upgrade to a newer laptop in a few months? I had to replace the battery in this one after only two years and unfortunately broke one of the hinges in the process, so it's kind of a pain to open and close now. I actually have two 26 inch monitors and wireless keyboard and mouse connected that I use it with. I don't use the laptop alone, or by itself much really, unless I travel or something. 

But again, thanks for everyone's help on this problem of mine. We exhausted a lot of possibilities for sure. Learned a lot in the process, so thanks for all that knowledge!