More Than 33,000 Times Faster!
The 4004 Intel processor in 1971 had a speed of 108 KHz (kilohertz, 10 to the 3rd power).
The Intel Pentium 4 processor runs at 3.6 GHz (gigahertz, 10 to the 9th power).
If I did my math correctly (.0333 x 10 to the 6th), computers today are more than 33,000 times faster than in 1971, or at least that is the increase in the speed of the microchips. The original microprocessors were used in the Busicom calculator/adding machine (see picture above).
See Intel's microprocesser timeline here.