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Builder Scheduling/Management Tactics
Aside from getting more builders to work for you, you can try to schedule and utilize them in effective ways.
Plan your upgrade, and try to raid for enough resource before builder is available.
Do not let the worker sleep for long period of time, or keep one builder to upgrade wall, it’s not effective!
Schedule your upgrade to finish in different day/time, so that you don’t need to raid too much resource. Or if you raid too much gold, you can upgrade some wall in between and not be upset because of Gold Storage are full.