Quick test with siege, accessing Stroudco shop page:
2 repeats, 2 concurrent users:
Transactions: 48 hits
Availability: 100.00 %
Elapsed time: 10.80 secs
Data transferred: 9.02 MB
Response time: 0.42 secs
Transaction rate: 4.44 trans/sec
Throughput: 0.84 MB/sec
Concurrency: 1.85
Successful transactions: 48
Failed transactions: 0
Longest transaction: 2.66
Shortest transaction: 0.09
2 repeats, 10 concurrent users:
Transactions: 240 hits
Availability: 100.00 %
Elapsed time: 26.58 secs
Data transferred: 45.11 MB
Response time: 0.92 secs
Transaction rate: 9.03 trans/sec
Throughput: 1.70 MB/sec
Concurrency: 8.34
Successful transactions: 240
Failed transactions: 0
Longest transaction: 10.04
Shortest transaction: 0.09
10 repeats, 10 concurrent users:
Transactions: 1200 hits
Availability: 100.00 %
Elapsed time: 123.83 secs
Data transferred: 225.56 MB
Response time: 0.98 secs
Transaction rate: 9.69 trans/sec
Throughput: 1.82 MB/sec
Concurrency: 9.48
Successful transactions: 1200
Failed transactions: 0
Longest transaction: 8.98
Shortest transaction: 0.08
For me this suggests the server can be ~7s slower when there are more concurrent users. But that’s likely to be rare.
This is just commandline download though. When rendering the page Chome shows:
So there is a big chunk of time spent rendering and loading all the product pictures!
It would be useful to try this with Puma of course.