Been measuring my own personal performance over the first few months of the year. All measurements really solid but dipped just before Easter. One thing I learned - once you're in a dip, it's hard work to get out of it (better to avoid the dip in the first place, if you can). It's very easy to find ways to spend your time - but to really perform, you need to work to targets and objectives. You also need to manage your energy levels - avoiding burnout whilst continuing to perform (a question of short-term benefit making longer term damage).
Here are my top tips for personal performance:
1) break long term objectives into short-term, achievable goals
2) measure your performance against these goals
3) reward yourself for achievements
4) learn to treat failure as part of the job