### Last week: * [spec2] fixed the last remaining issue with full-replace layouts. * [spec2] fixed the visibility of windows on gtk: the backend was drawing windows before receive the open message (because of the visibility settings) * [spec2] made a mock up of “generator based list presenter” : a way to not need to feed all items to a list before displaying them (this should sped up big lists, and rescue the fast table main purpose). * spent part of the day looking for improvements on the callback speed. Figured out looking for a callback by address is time consuming because it makes an #isKindOf: very frequently. I made a PR to make the comparisson faster. * [big-images] made calypso modification about TabManager go into Pharo8 (maybe issues remaining? We will see, hopefully not). * [big-images] start analysis on speeding up senders/implementors/references (this should also help for refactors later) ### This week: * [big-images] finish senders/implements/references speed up