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Yeah, that seems plausible to me. I had major IBD slowness a few years ago and wrote about it on SN. I think I isolated it down to either a slow disk speed (I had a SSD but connected via a USB3 cable), or slow CPU (I was running it on a Rpi4). Possibly an issue with RAM speeds. But I never really isolated the problem. I'm pretty sure it wasn't data bandwidth or amount of RAM though.

I think USB speed was the culprit. After starting an IBD on pi4, I took out SSD and plugged it into my gaming PC booted to Debian from a thumb drive. That IBD finished in a few hours if I remember correctly.

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