Cydia Substrate, a method of tweak injection that can be used on both the checkra1n and unc0ver jailbreaks, was updated Monday evening to the shiny new version 0.9.7105.
Citing the change log for this particular release, Cydia Substrate v0.9.7105 should be easier on system memory and be less prone to crashing due to a new memory limit threshold system. The full change log from Saurik is quoted below: