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Since these are branded terms, I would recommend that you do a simple search on Google to see if your competitors are already paying for your branded term. Not all of them do, especially if your branded term is irrelevant to your products. More likely than not, if you are ranking 1 organically and not paying for your branded term in PPC you will still get upwards of 90% of the clicks. Most people searching by brand already know what they are looking for and where they want to buy it. They will look for your SERP. If you want to test the theory, turn off the paid campaign for a week and see if the traffic on branded terms increases organically or if you see a huge decline in traffic. AdWords is easy to Beta. Maybe it isn't cutting spend altogether, but dropping your bid to position three. Having two listings next to each other is the holy grail of SERP positioning.

Hi there, There are many reasons a website may be slow, below are some of them: A huge spike in Additional Traffic. A Dynamic Site without caching. Extremely Large or non-optimized graphics. Extremely Large or non-optimized database. Large amount of calls to external websites (twitter, facebook, youtube, etc...) Connectivity issues Hope it helps you