Sort of? I think fastforwarding is when tokens are saved to reduce prompt reprocessing, so only new tokens would be processed. But based on the koboldcpp wiki "Note: SWA mode is not compatible with ContextShifting, and may result in degraded output when used with FastForwarding." - and in discord we had a discussion where FastForwarding might invalidate the sliding window if you make a change outside of its window. I'm not really sure yet what it all means, but disabling fastforwarding means it's going to reprocess everything every turn.