Four ways to speed up a delivery in anything (mail or electrons) is to:
1. increase velocity of transfer
2. decrease distance
3. send more packets at once
4. decrease required number of packets to send
Increasing speed:
You can't speed up velocity of electrons easily, but you can use faster signaling material like light. Yet building tiny integrated circuits with light is impossible at present day technology. Of course research might make it someday possible

Larger scale components are being coverted to optical signals now-a-days, though.
Decreasing Distance:
Decreasing the size of transistors and circuits is very important; half the distance can be travelled at half the time in same velocity. Decrease in size also save space. (at the cost of more interferrance and heat) A process of using water to allow higher precision of manufaturing is now getting spotlight.
Sending more at the same time:
Increasing bus is one form of this. Increasing the numbers of CPU and parallel processing has been popular for a while. The world's best supercomputers are simply smaller computers clustered to gather. Programming efficient parallel processing code is now an important topic in computer science. Intel's HyperThreading is another form of doing more at once. RAID, internet idle-time sharing projects, and dual-core CPUs all rely on this principal. Coming up are biochemical computers which use chemical reaction to calculate massive amounts of data. Quantum computing is also a form of using chemical properties of quantum physics to perform unbelievable amounts of calculations at the same time; although at less precision. Quantum computers have much spolight these days; I believe someone just created a working emulator.
Decreasing total calculation:
Compression of data is important in data transmission. New methods of compressions are always being researched. Current day computers use binary representation, but what if we represent more digits in one particle? Optical computing may be able to use different wavelengths of light to represent size of a number.
So there are lots of possible futures for computing

No worries!