How do you WOW your clients?

Today I was with a client all-day meeting with potential business partners for them. It was a great experience and find myself always taking things away on how to add value back to my client. I want to hit on one major value add - Speed. This is one thing my client told me we do well. How can you just flat out be faster in your day-to-day? How do I compress time?

I put things into 15-minute time blocks and get AS MUCH as I can done in that time.

Any other tips and tricks for productivity? Let me know your thoughts!