Multiselect filter for text field in big list

I have a big list with about 40K records. I need to filter this list with a multiselect filter (text field element with serial numbers). I can modify the Filter List Max in global settings but this way the list load time is increasing dramatically.

Any chance to have multiselect aoutocomplete field? I CAN PAY FOR THIS MODIFICATION!!! Or any other idea?
 
We are in need of some funding.
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Thank you.

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