diff --git a/php/Block.php b/php/Block.php
index bc270e4..ce17920 100644
--- a/php/Block.php
+++ b/php/Block.php
@@ -63,66 +63,94 @@ public function register_block() {
 	 * @return string The markup of the block.
 	 */
 	public function render_callback( $attributes, $content, $block ) {
-		$post_types = get_post_types(  [ 'public' => true ] );
-		$class_name = $attributes['className'];
+		$post_types = get_post_types( [ 'public' => true ], 'objects' );
+		$class_name = sanitize_html_class( $attributes['className'] ?? '' );
+		$current_id = get_the_ID();
 		ob_start();
 
 		?>
-        <div class="<?php echo $class_name; ?>">
-			<h2>Post Counts</h2>
+		<div class="<?php echo esc_attr( $class_name ); ?>">
+			<h2><?php _e( 'Post Counts', 'site-counts' ) ?></h2>
 			<ul>
-			<?php
-			foreach ( $post_types as $post_type_slug ) :
-                $post_type_object = get_post_type_object( $post_type_slug  );
-                $post_count = count(
-                    get_posts(
-						[
-							'post_type' => $post_type_slug,
-							'posts_per_page' => -1,
-						]
-					)
-                );
-
+				<?php
+					foreach ( $post_types as $post_type_slug => $post_type_object ) :
+						$post_type_object = get_post_type_object( $post_type_slug  );
+						$post_count       = wp_count_posts( $post_type_slug )->publish;
+						?>
+		
+						<li><?php printf( __( 'There are %d %s.', 'site-counts' ), $post_count, $post_type_object->labels->name ); ?></li>
+						<?php
+					endforeach;
 				?>
-				<li><?php echo 'There are ' . $post_count . ' ' .
-					  $post_type_object->labels->name . '.'; ?></li>
-			<?php endforeach;	?>
-			</ul><p><?php echo 'The current post ID is ' . $_GET['post_id'] . '.'; ?></p>
+			</ul>
+			<p><?php printf( __( 'The current post ID is %d', 'site-counts' ), $current_id ); ?></p>
 
 			<?php
-			$query = new WP_Query(  array(
-				'post_type' => ['post', 'page'],
-				'post_status' => 'any',
-				'date_query' => array(
-					array(
-						'hour'      => 9,
-						'compare'   => '>=',
-					),
-					array(
-						'hour' => 17,
-						'compare'=> '<=',
-					),
-				),
-                'tag'  => 'foo',
-                'category_name'  => 'baz',
-				  'post__not_in' => [ get_the_ID() ],
-			));
 
-			if ( $query->have_posts() ) :
-				?>
-				 <h2>5 posts with the tag of foo and the category of baz</h2>
-                <ul>
-                <?php
+				// Check if cache data exists in site_counts group.
+				$query = wp_cache_get( 'sc_baz_foo_filtered_posts', 'site_counts' );
 
-                 foreach ( array_slice( $query->posts, 0, 5 ) as $post ) :
-                    ?><li><?php echo $post->post_title ?></li><?php
-				endforeach;
-			endif;
-		 	?>
-			</ul>
+				if ( false === $query ) {
+					$query = new WP_Query(  array(
+						'post_type'              => ['post', 'page'],
+						'post_status'            => 'any',
+						'posts_per_page'         => 6, // Total posts plus count of excluded posts.
+						'no_found_rows'          => true,
+						'update_post_meta_cache' => false,
+						'update_post_term_cache' => false,
+						'date_query'             => array(
+							array(
+								'hour'    => 9,
+								'compare' => '>=',
+							),
+							array(
+								'hour'    => 17,
+								'compare' => '<=',
+							),
+						),
+						'tax_query'      => array(
+							'relation' => 'AND',
+							array(
+								'taxonomy'         => 'category',
+								'field'            => 'slug',
+								'terms'            => 'baz',
+								'include_children' => false,
+							),
+							array(
+								'taxonomy' => 'post_tag',
+								'field'    => 'slug',
+								'terms'    => 'foo',
+							),
+						),
+					));
+
+					// Since we are dealing with large set of data here, We can store the entire query result in the cache group.
+					wp_cache_set( 'sc_baz_foo_filtered_posts', $query, 'site_counts' );
+				}
+
+				if ( $query->have_posts() ) :
+					$post_count = 0;
+					?>
+					<h2><?php printf( __( '%d posts with the tag of foo and the category of baz', 'site-counts' ), 5 ); ?></h2>
+					<ul>
+						<?php
+							while ( $query->have_posts() ) :
+								$query->the_post();
+								if ( $current_id !== get_the_ID() && $post_count < 5 ) {
+									$post_count++;
+									?>
+									<li><?php echo esc_html( get_the_title() ); ?></li>
+									<?php
+								}
+							endwhile;
+						wp_reset_postdata();
+						?>
+					</ul>
+					<?php
+				endif;
+			?>
 		</div>
 		<?php
-
 		return ob_get_clean();
 	}
 }