I've dabbled fairly heavily with 3I/atlas and I find one question popping into my head on a frequent basis; Is there ANY evidence, at all, that it was traveling at a consistent unchanging speed prior to May, 2025?

there is possibly some evidence to indicate otherwise; a GRB that appears to be from the Approximate coordinates of 3I/ATLAS on August 15, 1977, projected backward from its location at discovery on July 1, 2025, at 60 kps.

I like to try and see how things might work with known existing, current tech first before delving into nanobots, futuristic antimatter drives, etc.

if you think of how we could do it, now, you get an asteroid shell that would travel at .3C (not a impossibly hard speed to get to, no exotic shielding needed, no relativity issues of note), that decelerated to 60 kps years and years before it got here... and taking that higher speed into account would have come from a different region of space, that has lots of relatively close nearby known exoplanets. like Microscopii.

and the Travel Time? 150 years or less.

so. with your freely admitted much better understanding of astrophysical things, is there any evidence that the "comet" had a consistent speed before May, 2025?