Im pretty sure it is. Can you imagine 800 routes being automatically being adjusted by the server at the same time?
I've also noticed significant inconsistencies in response time. Sometimes it's instant, sometimes it takes 3-4 full minutes to advance a single page click.
Regarding the 800 routes recalculating, IIRC a bulk change to IFS defaults (and clicking the link to update existing routes) can also trigger hundreds of route recalculations at once on a given airline.
This would take hours to manually do for a player, and is the type of change that airlines in the real world can implement quickly fleetwide (witness UA upgrading food and coffee options worldwide in a fraction of the lead time to acquire a new plane in the real world).
I'd propose keeping the route recalc triggers (prices, IFE, etc.) but slowing down the rate at which they auto-recalculate, to free up more server resources to active gameplay.
I'd also propose a tiered gameplay system so that Yuxi can finance new servers, similar to what some of the FSX download sites used to do: keep the game free, with free standard server resources and response times, but offer a "First Class" subscription where, for a few dollars, Euros, etc. per month, you can be guaranteed the fastest server times and access. The revenue would finance additional servers, speeding things up considerably for the game "players in F" beyond even what they used to be before the recent slowness, while fixing the horrid response times for "players in Y."