For educational purposes
The swing wing was an answer to the problem of how to achieve Mach 2+ speeds in flight while maintaining safe handling at low speeds for take off and landing.
One way you can make a fighter faster is to increase the sweep angle of the wing's leading edge like the The Mikoyan-Gurevich MiG-23 and MiG-27 "Flogger" series.
Including Sukhoi Su-17 / Su-20 / Su-22 "Fitter" and Su-24 "Fencer"fighter-bomber series.
