MBP number of Thunderbolt controller/channel

Is there a place to check actual TB controllers/channels each MBP has? I have a high speed external SSD attached to a TB 3 port, and plan to add a 4k display, but does not want the display to hijack TB bandwidth and slows the SSD.

I’m getting about 2.3-2.5G/s read-write on that SSD, theoretically only half of TB full bandwidth, which means it is possible to drive other devices on the same channel, but would like to avoid if possible assuming certain TB ports shared the same channel/controller.

Apologies if the above not making much sense, I’m not a hardware expert, only once came across articles saying some ports on MBP are shared, much like a USB hub.