it's all in the drive motor and lens array - many of the slimline players chop lots of parts out of the lens array (especially the optical mounts) and change the spindle motor for a cheaper, lighter wafer motor (the part that moves the disc is mounted on a magnet, which spins as the circuitboard-mounted electromagnets pulse.)
That wafer motor does not reach the proper speed quickly as there's no inertial mass, nor would it tolerate imbalance due to stickers on the disc- it would vibrate too much.
Another hidden factor could be the disc clamp, those springs don't hold the disc better than the clamp array, which prevent the disc from "floating" as it spins.
The lens array from the slimline ones don't use a proper laser, it's usually a chip LED, a chip optical pickup, both surface mounted on an etched ribbon cable, with a plastic mirror lens inside a single axis electromagnet. Glass mirror lenses have better durability, as the reflector part is a pure metal reflector. The only way a plastic can reflect as a mirror is through a chemical process, which can degrade as the plastic ages, and/or is exposed to other uncured plastics' fumes, during the manufacturing process.