It took about 6h to sync my node with monerod 0.10.0 (It might have taken less time, I can't recall the exact time unfortunately)
Monero has about 240,000 tx in the blockchain last year. (moneroblocks.info)
I couldn't find the Monero total tx number.
I will assume 300,000 should be a good estimate.
That seems to suggest my computer can handle 300,000 x 4 = 1,200,000 tx a day. About 14 tx/s
It is a fair estimate?