As the OP didn't specify, we are left to presume what it is about the process that is deemed to be too slow. Experience does
strongly suggest that -- given the scraper is in the same linear thread as the DBI operation upon which it must wait before proceeding to the next scrape -- the part which is troubling the OP is almost certainly the speed with which it proceeds from one scrape operation to the next.
Thus BrowserUK is likely correct that relief is likely to be found in stacking up the updates guided by a multi-threaded scraper to a single-threaded DBI queue -- it moves the most likely point of contention and delay outside the loop which constrains the operation which is deemed to be, in the OP's words, "too slow".
However, it is only prudent to point out that if this assumption were to prove to be incorrect, and the user is hoping to improve the speed of the SQLite updates and not merely improve the scraper hang time, that the scraper::queue::DBI model might not produce the gains the OP was hoping for. It's a corner case, almost certainly, but the corner is not imaginary.
I agree that, absent information to the contrary, it is a side note and not the meat of the response. But I don't think sundialsvc4's response is necessarily out-of-band.