The drawers in the master bathroom were not performing well, so I inspected the sliding hardware and discovered the most half-assed workmanship I've seen in a while. All the hardware was mounted with small staples and maybe tacks.
I replaced the pitiful staples with stainless (my trademark) screws. The drawers now slide much more smoothly. I often fling them out now because I'm so used to having to really pull to get them open.