Nch mosfet direct driven with pic

[longpole001]

it seems 100R in series with the NCh that drives just a normal LED is the go else when the pic is told to turn off the mosfet i need a pause after the command to allow the LED to turn off

[Art]

Why can't you switch the IR LED with a signal transistor, or directly from the pic pin?

[Charlie]

I have not looked at the datasheets for your specific devices, but in general you don't need any configuration of resistors - you can drive the gate directly from the PIC pin, as long as the pin can pull high and low. I do this all the time with N channel devices. If you intend to tristate the pin, you would want to add a resistor to the appropriate rail to make sure it is off (or on) in that situation.
If you need 100 mA, directly driving simply won't work.