remote controll with arduino and attiny85

Hi, I needed to know some information or some advice on how to do it with an attiny85 at 1Mhz of internal clock for consumption savings. Since I can not switch to an arduino that acts as a receiver, use the VirtualWire.h library because it has specific commands for my project, what can I do? do you have any microcontroller that works at 1Mhz or less to advise me?