What hardware slows down speed to load a program, bottleneck

[C555]

Hi, I have the following setup =

AMD Ryzen 5 3600X 6 Core @ 4.1GHz
32GB 3200Mhz Ram
Intel SSD Intel Hardrive SSDSC2BW180A4 (this is quite old)
2x AMD Radeon RX 6600
6x 2560x1440 monitors
B450plus motherboard
Internet - 370mbps / 36mbps Latency all under 30

One of the above seems to be causing a bottleneck when loading new items or if I am using all the screens with charts etc.

Best way to describe it - I want to open a new chart or similar and there is a gap between clicking the mouse and it loading it.
It's the speed of the loading element I'm interested in, I need it to be faster.
I have monitored task manager and other than normal spike's nothing shows any particularly high usage.

Thanks !

[C555]

Thanks for all the great input ! To answer some questions -
- It's ethernet connection and yes its for stocks and shares so speed is important.
- One monitor, I shall try this tomorrow.
- Its a standalone trading software but its quite basic and my other PC handles it fine.
- I will check and clean the heatsink.

- I just did a readspeed, as you and others have noticed the SSD is over 10 years old, by far the oldest component.
It has 95gb of 160gb free.
The results were - 448.9 527.8 538.4 539.4 505.3
Would the drop in the first figure be enough to be noticable ?
I have a similar spec work desktop which runs perfectly, the hard drive being the only noticeable difference as the work one is a much more recent build. Makes me think that the hard drive looks the most likely culprit ?