To address computationally expensive tasks in web applications, Laravel framework uses a job queue system with built-in support for queued jobs and workers to process them later, utilizing Redis as a datastore. However, traffic spikes can cause jobs to accumulate in the queue if not enough workers are assigned. To mitigate this, a threshold is set to send an SMS notification when the queue wait time exceeds a specified limit using Nexmo's event-based services, allowing developers to quickly increase worker capacity and resolve issues.