Just like you wouldn't keep pouring water into a leaky bucket, you don't want to keep sending traffic to a slow website. Poor performance can hurt conversion, so it is a good idea to check your website before spending money to drive traffic to it.
When you are building a startup and looking to grow your team, one topic that is very likely to pop up are freelancers, but if you are a first-time founder you might not know what to expect from them.