The answer to 'P-trap slow draining' is a slow-draining P-trap is usually caused by a clogged or partially clogged drain pipe. This can happen due to buildup of hair, soap scum, or other debris over time. Symptoms include water draining slowly or not fully clearing the trap.
The solution often involves removing the P-trap and using a plumber's snake or auger to clear the clog in the drain pipe. This is a relatively simple DIY fix, but you may need to call a professional plumber if the clog is deep in the pipes or you are uncomfortable working with the plumbing.