It certainly was Matt! Especially when doing a long cross country as we required a lot of fuel in the tanks. With 2 up in a C152, full fuel and ridiculously hot temperatures, it's not just the T/O and landing distances that you have to consider... the climb performance also takes a massive hit.
When we left San Carlos we had to remain at 1000 feet to stay 500ft below class Bravo until we were just south of the airfield, then we had to climb to 2,000ft very fast to clear Palo Alto's class Delta airspace. We ended up routing around their airspace over the water because we weren't climbing fast enough. I think at one point we were only managing around 250ft/min!