cache_mode (integer: 0-2, default 0) controls whether or not PyMOL retains precomputed geometries (such as molecular surfaces) inside the session file.
0: off
1: read only
2: retain all new surfaces computed
cache_max (integer, default: 1250000) controls how many primitive data elements can be retained in the geometry cache (before old/unused entries are expired).
cache_memory (boolean, default: off) special case, currently unsupported setting.
fast_idle (float, default: 20,000) affects idling behavior and should not normally need to be modified.
hash_max (integer, default: depends) controls the maximum amount of memory used by the various temporary 3D hash tables used in geometry generation and raytracing.
idle_delay (float, default: 1.5) affects idling behavior and should not normally need to be modified.
max_ups (integer, default: 0) throttles PyMOL to a maximum number of updates per second. When set to 0, PyMOL updates as quickly as possible.