If you are a TM WhatsApp user and your WhatsApp mod is delaying sending or receiving messages, try this:-
1:- Go to (TM Mods >> Privacy Settings >> Show Blue Ticks on Reply.) Disable the feature.
2:- Still in Privacy Settings open the privacy custom settings of CONTACTS, GROUPS, BROADCASTS and disable all ticks.
3:- Now go back to TM Mods and restart TMWhatsApp then check if or not the issue has been solved.
NOTE: Another possible cause of this problem is when you send so many messages to different contacts at once.
Source: TM WhatsApp Telegram
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