If you're on FreeBSD you can use dummynet to simulate packet delay and loss.
It's quite handy. My partner has slow, unreliable, high-latency Internet in his house and there are an entire class of performance problems that are extremely obvious when I work from his place that are barely measurable when I work from a 100mb line that's only a few milliseconds away from a major datacenter.
It's quite handy. My partner has slow, unreliable, high-latency Internet in his house and there are an entire class of performance problems that are extremely obvious when I work from his place that are barely measurable when I work from a 100mb line that's only a few milliseconds away from a major datacenter.