What does "scalar rate of one per clock" mean?

Question

I read the following sentence from Intel Manual. Since I am nota native English speaker, I am not quite sure what "scalar rate of one per clock" means. Could anyone explains it to me? Thanks.

An 8-KByte on-chip first-level cache that increased the percent of instructions that could execute at the scalar rate of one per clock

Answer 1

In my words: scalar is the "weight" or "measure unit" of a function or property, in your case a clock unit. So the manual reads like this: the L1 cache on the CPU increased the percent of instructions with one instruction per one CPU clock unit.