@K4ROGER
Apple manufacturing finished transition from Motorola to Intel in 2006, so that's not an issue.
The key factors are the OSX version in use and the specification of the hardware: at approaching a decade old a typical Mac of that vintage is underpowered even compared to a PC of the same age because Apple profit margins have always been somewhat ambitious.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
