# objspace.std.withmapdict

- name: withmapdict
- description: make instances really small but slow without the JIT
- command-line: –objspace-std-withmapdict
- command-line for negation: –no-objspace-std-withmapdict
- option type: boolean option
- default: False
- requirements:
  - objspace.std.getattributeshortcut must be set to ‘True’
  - objspace.std.withtypeversion must be set to ‘True’

Enable the new version of “sharing dictionaries”.

See the section in Standard Interpreter Optimizations for more details.