With the addition of JS snippet support to Orion's ad blocker, would it be more efficient to pre-load/use the Safari optimized privacy and annoynces list instead of the Easylist/Fanboy's variants? I have made this change on my install of Orion without issues in my testing.
Add the following lists to the "Manage Filter List" view with the Adguard privacy option enabled by default instead of EasyPrivacy.
Adguard Optimized Privacy: https://raw.githubusercontent.com/AdguardTeam/FiltersRegistry/master/platforms/extension/safari/filters/3_optimized.txt
Adguard Optimized Annoyances: https://raw.githubusercontent.com/AdguardTeam/FiltersRegistry/master/platforms/extension/safari/filters/14_optimized.txt