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Rendering speeds in Motion 5 and FCP depend almost entirely on your Graphics Card (GPU). If your card's performance is not sufficient, then your host app may significantly slow down.
This is especially the case for Macs that have only an Intel card installed: such machines are not designed to be used for editing purposes – their computing power is extremely low and additionally, they are a source of many issues (such as artefacts, unexpected app behavior, crashes etc.).
In such cases, the only thing that we can recommend is either switching to a Mac with a dedicated graphics card or upgrading your current machine with an eGPU.