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Under a limit on concurrency, AJAX requests in the browser may become executed sequentially if the limit is reached. The number of simultaneous requests that can be made in a browser is limited by the browser itself and also by the server serving the requests. When the limit is reached, the browser may queue additional requests and wait for the limit to be lifted before making more requests. However, it is important to note that not all requests will be affected by this limit, as it typically only applies to requests made to the same server or domain. Requests to different servers or domains can still be executed in parallel.