The one with the biggest amount of transactions is 2,945 tx on it, and tx are each 10 minutes. so, taking about seconds i would say:
2954/60=4.92 transactions/second.
2954/60=49.23.... typo?
If we're comparing it with Visa, then Bitcoin is still faster since sending a transaction to mempools only take a second.
Yes, it's at risk of double-spend while unconfirmed but that's also the case with banks transfers which have a way longer reversal/chargeback window.
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lhrbeijing For the lightning network, it can't be answered since transactions are done in between channels and their routes.
But considering that the speed of each lightning transaction only take seconds, it would be far higher than in the mainnet.