Original sentence: It is available as a free download for several architectures, covering both Intel and AMD processors, and several versions of Firefox.No definitive benchmarking has been reported, but a faster startup time together with a small speedup (1.7%) has been reported.Several versions of Swiftfox are available for specific types of microprocessor architecture.Swiftfox is distributed under its own non free license, which does not allow redistribution.compiling with higher level of compiler optimisation (-O3, where the normal builds are -O2)]
Edited sentence: A faster startup time,  together with a small speedup (1.7%) has been reported.It  distributed under its own non free license, which does not allow redistribution.Several versions of Swiftfox may be downloaded for specific types of microprocessor architecture.Swiftfox is not licensed under a Free Software license.compiling with higher level of compiler optimisation (-O3, where the normal builds are -O2)