The wipers have a weak motor from the factory. The longer the wiper blades, the slower they go. One trick is to look at your wiper motor under the hood and see if the 3 wires go through resistors before the motor. If so, bypass the resistors. It is a simple plug and play thing. It might help some.
If it is already bypassed. Then all you can do is only use them when the glass is wet.
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