Again, a reasonable and helpful person might answer:
"- I used database module X in this and that manner for a somewhat similar project with a database about the same size and I saw lookup times between 0.1 sec and 0.3 sec on XYZ hardware out of the box. From what you describe, your lookups should be in the same ballpark."
Or: "- If 20MB including the DB engine and the TK gui is reasonable for you, then yes. PAR::Packer should have no problem packing the DB module XXX, I've done it before. It can't pack DB module YYY, though, so don't use that if you need to pack the whole thing into an exe with PAR::Packer."
BTW "run-of-the-mill laptop" is
a meaningful performance spec. It can be reasonably assumed to mean something along the lines of a mid-tier corei3 or i5 with the integrated video card, 4GB of DDR3 RAM and a 5400 RPM 2.5" platter drive.
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