defer printing to reduce lag

Lua/event flag monitor.lua

@@ -46,7 +46,7 @@ function FlagMonitor:mark(i, x, x1)
                 str = str..' (NEW!)'
             end
             if not ignore[str] then
-                printf('%s  @%i', str, now)
+                dprintf('%s  @%i', str, now)
                 message(str, 180)
             end
         end
@@ -124,6 +124,7 @@ elseif oot then
         igi:save()
         it_:save()
         ei_:save()
+        print_deferred()
         draw_messages()
         emu.frameadvance()
     end

Lua/messages.lua

@@ -46,3 +46,34 @@ function draw_messages()
     messages = okay
     __messages_then = now
 end
+
+__dprinted = {}
+
+function dprint(...) -- defer print
+    -- helps with lag from printing directly to Bizhawk's console
+    table.insert(__dprinted, {...})
+end
+
+function dprintf(fmt, ...)
+    table.insert(__dprinted, fmt:format(...))
+end
+
+function print_deferred()
+    local buff = ''
+    for i, t in ipairs(__dprinted) do
+        if type(t) == 'string' then
+            buff = buff..t..'\n'
+        elseif type(t) == 'table' then
+            local s = ''
+            for j, v in ipairs(t) do
+                s = s..tostring(v)
+                if j ~= #t then s = s..'\t' end
+            end
+            buff = buff..s..'\n'
+        end
+    end
+    if #buff > 0 then
+        print(buff:sub(1, #buff - 1))
+    end
+    __dprinted = {}
+end