Azure SQL Database Service Tiers and Performance Levels

Even basic supports 5 transactions per second based on Microsoft internal benchmarking. I guess we should cut the value in half for real world performance. But i would think that most web sites could run well on the Basic plan.

Plan	DTU	Benchmark	Rating	Per Hour	Per Minute	Per Second
Basic	5.0	16,600 transactions per hour	Good	16,600	277	5
Standard/S0	10.0	521 transactions per minute	Better	31,260	521	9
Standard/S1	20.0	934 transactions per minute	Better	56,040	934	16
Standard/S2	50.0	2,570 transactions per minute	Better	154,200	2,570	43
Premium/P1	100.0	105 transactions per second	Best	378,000	6,300	105
Premium/P2	200.0	228 transactions per second	Best	820,800	13,680	228
Premium/P3	800.0	735 transactions per second	Best	2,646,000	44,100	735

http://msdn.microsoft.com/library/azure/dn741336.aspx