Should I use a squishy mousepad with a heavy mouse?

No, don’t use a squishy mousepad with a heavy mouse. The foam compresses unevenly under the weight, tilting the sensor and causing jittery cursor movement or missed swipes. Lighter mice under 80g are fine, but anything approaching 100g+ will dig in, especially on gel memory foam pads. Stick with a stiffer neoprene or thin desk pad for comfort and accuracy.