Question about using ob_start()

I was reading the code of a plugin which adds a facebook link in the footer of each posts.The plugin has a settings page. The callback for the options page is given below :

// Create Options Page Content
function ffl_options_content(){

	// Init Options Global
	global $ffl_options;

	ob_start(); ?>
		<div class="wrap">
			<h2><?php _e('Facebook Footer Link Settings', 'ffl_domain'); ?></h2>
			<p><?php _e('Settings for the Facebook Footer Link plugin', 'ffl_domain'); ?></p>
			<form method="post" action="options.php">
				<?php settings_fields('ffl_settings_group'); ?>
				<table class="form-table">
					<tbody>
						<tr>
							<th scope="row"><label for="ffl_settings[enable]"><?php _e('Enable','ffl_domain'); ?></label></th>
							<td><input name="ffl_settings[enable]" type="checkbox" id="ffl_settings[enable]" value="1" <?php checked('1', $ffl_options['enable']); ?></td>
						</tr>
						<tr>
							<th scope="row"><label for="ffl_settings[facebook_url]"><?php _e('Facebook Profile URL','ffl_domain'); ?></label></th>
							<td><input name="ffl_settings[facebook_url]" type="text" id="ffl_settings[facebook_url]" value="<?php echo $ffl_options['facebook_url']; ?>" class="regular-text">
								<p class="description"><?php _e('Enter your Facebook profile URL', 'ffl_domain'); ?></p></td>
						</tr>

						<tr>
							<th scope="row"><label for="ffl_settings[link_color]"><?php _e('Link Color','ffl_domain'); ?></label></th>
							<td><input name="ffl_settings[link_color]" type="text" id="ffl_settings[link_color]" value="<?php echo $ffl_options['link_color']; ?>" class="regular-text">
								<p class="description"><?php _e('Enter a color or HEX value with a #', 'ffl_domain'); ?></p></td>
						</tr>

						<tr>
							<th scope="row"><label for="ffl_settings[show_in_feed]"><?php _e('Show In Posts Feed','ffl_domain'); ?></label></th>
							<td><input name="ffl_settings[show_in_feed]" type="checkbox" id="ffl_settings[show_in_feed]" value="1" <?php checked('1', $ffl_options['show_in_feed']); ?></td>
						</tr>
					</tbody>
				</table>
				<p class="submit"><input type="submit" name="submit" id="submit" class="button button-primary" value="<?php _e('Save Changes', 'ffl_domain'); ?>"</p>
			</form>
		</div>
	<?php
	echo ob_get_clean();
}

I am curious about the usage of ob_start() while drawing the option page . I have read up on ob_start() and how it works and understand it improves performance by buffering the whole HTML and outputting it together . My question is , is it recommended to use ob_start() while displaying things in the front end ? Like I end up using shortcodes a lot and most of the time there is much more HTML code in the front end that in the options page . I have never used ob_start() when I code shortocdes , do I start using them for better performance ?