A4, A6, A8, A10, E1, and E2, doesn't matter what it is, they're all embedded notebook processors with bigger cores than Bay Trail, despite same physical size.
https://en.wikipedia.org/wiki/Socket_FP3
E2-6110 1.50GHz is clocked lower than Celeron J1900 2.00GHz, yet E2-6110 is rated 50 points higher on single-thread than J1900, which means it has bigger cores than J1900. All the Bay Trails have tiny cores, high-speed embedded tablet processors, cheaper build quality, and weaker performance.
To keep things simple, E1-2100 1.00GHz will act almost 2 times faster than Celeron N1000 (if available) rated at 1.04GHz locked with no turbo burst available. Celeron N1000 would be equivalent to Pentium III 850MHz.