in general tradelink is low latency so you can send as many orders as you like.
regarding sterling.... if your sterling connector in tradelink is configured with rate limiting, you can control how many orders and cancels per second it will send. (iow it manages this for you). this is done by default to simplify things because most sterling users are on shared infrastructure. You can disable this though for reasons below.
in terms of whether you can bypass this limitation.... it depends on your broker.
the limitation comes into play when you use sterling's shared infrastructure (shared servers), which is what most sterling brokers use because it's cheaper.
some sterling brokers run sterling on their own servers, in these instances the broker can remove the rate limitation. then you will something closer to 100 orders/second.