Wed Feb 24, 2021 12:39 am
Your system can't handle more than HD and even that without complex effects.
And then, please check if El Capitan is meeting the minimum requirements. You may need High Sierra.
Resolve Studio 17 and Fusion Studio 17 under MacOS Mojave 10.14.6
iMac 2017 Radeon Pro 580 8 GB VRAM, 32 GB RAM
2018 Mac mini 16 GB RAM, eGFX Breakway Radeon RX 580 under Catalina 10.15.7
MacBook Air M1