There is no need to watch the whole 2 hour video, the important stuff occurs in the first 15 minutes.
Storm gave me this link : Firestorm Help Video Its very good and well worth watching. There is a voice transcript. Key issues is stuff like draw distance, Internet bandwidth and cache. Interestingly I have already the settings recommended and I don’t crash. I run HIGH with ambient occlusion and shadows. Bandwidth at 1024, draw distance at 128 I don’t crash and everything runs smoothly. I do not clear my cache, it is self purging. Always recommended is the Firestorm wiki. Its over an two hours so you might get tired but I was doing stuff like this while listening to it. The first 10 minutes could change your sl experience dramatically.