You will get tons of advise, from resetting your router, to clearing your cache, to deleting your Outfits, to standing on your head while reciting Poe. All of which may be good advise! Some quirks i h...
try turning your router on and off, turn it off wait 2 mins then turn it back on your router, restarting your computer as this clears any static build up, open CMD as a Admin, and type in ipconflig /f...
Could be a cache issue. If this is with Firestorm: Dee clean your cache. Opensim works different from SL here. For Secondlife, cleaning you cache is generally not advised. For Opensim, it's very neede...