If you've done an update lately to your iPad OS there is a known issue that affects some by slowing their wifi to about half its normal speed.
To remedy it go into settings, general, reset, reset network settings. It will act like it's doing a factory reset but it is only resetting your network and won't erase anything else.
After the reset input your settings for your router and see if it helps.
Some have suggested hold the power button and home button at the same time for about 15-20 seconds then leaving it off for at least a minute fixes theirs
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