That front mech cable routing looks pretty bad. The inner should not be touching the frame like that. Hard to see if the rear mech cable is the same but if it is then that would explain the stiff shifting.
@deleted started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
That front mech cable routing looks pretty bad. The inner should not be touching the frame like that. Hard to see if the rear mech cable is the same but if it is then that would explain the stiff shifting.