What is the least resistance in this RC circuit?

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In an RC circuit, lower resistance results in shorter charge and discharge times, typically approximated by the time constant 5RC. However, excessively low resistance can cause the circuit to behave predominantly like a capacitor, which may not be desirable. The minimum allowable resistance is influenced by the source resistance and the equivalent series resistance of the capacitor. Understanding these parameters is crucial for optimizing circuit performance. Therefore, careful consideration of resistance values is essential in RC circuit design.
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least resistance in RC circuit
Hello, I know that the lower the resistance the lower the charge/discharge time in an RC circuit, i.e. 5RC is about the charge/discharge time for the capacitor. But how small is the resitstance allowed to be? I'm guessing that the lower the resistance the more the circuit looks like it has just a capacitor (bad,yes?). Is there a specifice value of what the lowest resistance could be?
 
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To answer the question well, you need to consider the source resistance as well.

Is your question about a switched-on voltage source with an output resistance Rs, in series with an explicit resistor R1 and a capacitor C1 that has and equivalent series resistance of ESR1?
 
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