system/CodeIgniter.php
public function displayPerformanceMetrics(string $output): string
	{
		$this->totalTime = $this->benchmark->getElapsedTime('total_execution');

		$output = str_replace('{elapsed_time}', $this->totalTime, $output);

		return $output;
	}
public function displayPerformanceMetrics(string $output): string
	{
		$this->totalTime = $this->benchmark->getElapsedTime('total_execution');

		$output = str_replace('{elapsed_time}', $this->totalTime, $output);

		return $output;
	}
Replaces the memory_usage and elapsed_time tags.

@param string $output

@return string