With a fresh install of version 5.38 (jessie 4.14.15, idle since 5 min.), I've a CPU throttling and load issues :
CPU frequency never drop under 1200MHz and CPU load never drop under 1.00.
The same board and SD card with fresh install of version 5.35 :
CPU is most of the time @240MHz and load is way under 1.00.
I've found a different value in /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate file :