Data pull from TMDB

For some time now, getting data from TMDB after scraping is very slow at most times. I wonder if this may be due to the API restricting data flow? I question because with my API key I can get data without the delays here, but I know it could be a number of things. My question is that if it is possible it is the API key used causing delay, can we have an option to enter and use our own API key? I guess this can also apply to TVDB.