Just FYI: Running sbc-bench on Renegade with 5.4 kernel results in abysmal memory performance which also affects the overall performance.

Renegade at 1.5GHz with 5.4.8-rockchip64:

standard memcpy                                      :    878.6 MB/s (1.7%)
standard memset                                      :   3808.1 MB/s (2.7%)
7-zip total: 3074,3079,3050
cpuminer: 4.41,4.38,4.37,4.36,4.35,4.34,4.33,4.32,4.31,4.30,4.29,4.26

Rock64 at just 1.3 GHz with 4.18.0-rc5-1050-ayufan-ge70bd2ab8802:

standard memcpy                                      :   1338.6 MB/s (0.5%)
standard memset                                      :   5766.7 MB/s
7-zip total: 3533,3532,3539
cpuminer: 4.69,4.68,4.67,4.66,4.65,4.64,4.63,4.62

Please keep in mind that the Rock64 numbers were made with just 1.3 GHz and GCC 7.3 vs. 1.5 GHz and GCC 8.3.

I can't test with Rock64/current since owning only a pre-production board that doesn't boot or initialize Ethernet (different PHY) with mainline kernel. And I have no idea whether the culprit is with kernel, bootloader or whatever...

BTW: armbianmonitor -z functionality has been invented also for this reason: (automatic) checking whether an upgrade breaks stuff (performance in this case -- who wants a newer release that performs worse?)