Are there too many plugins for my site?

There are 18 plugins activated for my wordpress multisite.

And I have noticed that the CPU for my hosting at a Warning threshold very frequently and causing the site load time very slow. In fact there are very few visitors for my sites.

Is it because there are too many plugins activated causing http requests?

I have tried adding this code to the footer.php

<?php echo $wpdb->num_queries; ?> <?php _e('queries'); ?>. <?php timer_stop(1); ?> <?php _e('seconds'); ?>

And get the result:”176 queries. 0.754 seconds”

Is that normal for 176 queries?

This is my website: and there are 51 sub-sites.

Any help would be appreciated!