That is misleading, in my opinion. "100% faster" implies that runtime for a given workload is reduced by 100%, taking zero time. I think what you mean to say is either that it's 50% faster or that throughput is increased by 100%.

Surely faster means higher speed, and speed is something per time unit, e.g. miles per hour, or number of scans per second.

At least for me 100% faster does not mean the same as 100% less time was needed.