Make a new thread group

make a http req and give server name as koha.com

give path \

Make another http req with same data.

Add duration assertion

Give time in milliseconds.

Then if reqs tak more time to execute than given in duration assertion then reqs will fail and we can check results in assertion listener.

So basically in duration assertion we check whether the value load time(time take to process a request) in sampler result is less than, equal to or more than a given value etc.

Give response size field to check.Give size in bytes.Give whether we wanto check the size needs to be equal to,greater than ,less than etc.

Same way we can add a size assertion

Size assertion is used to check whether the size in bytes(which is the throughput) is equal to or less than or greater than a given value.