I don't know what the slowdown with that might be, but I'm pretty confident that it is not the fiber or router. I'm also guessing that an older system that's running Windows 7 just might not be very fast too, and that'll also affect broadband speed test performance.
And just a heads up, folks running Windows 7 systems should consider upgrading soon, per Microsoft they will no longer be providing security updates for it after January of next year:
https://www.microsoft.com/en-us/windows ... -7-support
And just a heads up, folks running Windows 7 systems should consider upgrading soon, per Microsoft they will no longer be providing security updates for it after January of next year:
https://www.microsoft.com/en-us/windows ... -7-support