Express TDS is very fast. Unlike most other products on the market it can process millions hits a day on modest hardware, such as cheap 512Mb RAM VPSs. It fully utilises multicore hardware, has good balance between disk i/o, memory consumption and CPU time. On a cheap 512Mb VPS you might expect it to process up to a few million hits per day, 50-100 requests per second. The short test on the localhost (Core i7 4700MQ 4 cores/8 threads 8G RAM, SSD) shows that the TDS can process more than 3000 hits per second with sub-second response time, if you dare. Realistically speaking, 20-30 millions hits per day, 300-500 hits per second on a decent server with multicore CPU should be possible.