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Old 12th January 2020
Feedback resistance and poles count. Above about 3k ohms stray capacitance across the resistor body can create a pole, then you need to cancel it with a small cap or ringing/oscillations can occur.

Other factors are involved such as bias currents, operational bandwidth and the output stage current. PCB layouts can create more poles to solve as stray capacitance can be created by proximity to other components or even ground planes placed directly underneath a film resistor.