I have a "load-problem" under ubuntu 14.04 with 4 Nvidia Cards on CUDA9:
(used latest 0.52 Version)

2121 root      20   0 51,978g 396036 351052 S 23,4  9,8   0:56.68 ./zm --server .....

compared with the older ewbf-miner 23,4% nearly continous load on a quad-cpu is huge.
I costs nearly 8 Watts extra energy. Can you please check, why the cpu-usage is so high ?

my used commandline:

./zm --server luckpool.org --port 3057 --user xxx.yyy --pass x --time

Tested with --api and without --time i have the same results with the cpu-load