Constant realsense_sys::rs2_host_perf_mode_RS2_HOST_PERF_LOW

pub const rs2_host_perf_mode_RS2_HOST_PERF_LOW: rs2_host_perf_mode = 1;

< low performance host mode, if host cannot keep up with workload, this option may improve stability, for example, it sets larger USB transaction granularity, reduces number of transactions and improve performance and stability on relatively weak hosts as compared to the workload