Remove Session ID is present in the URL sid=?8383830jndndn (If they are appearing on your installation)
Often when store development is underway, the Magento caches are switched off. They must be turned on in production.
Make sure all caching is on in:
Go to System Cache Management and ensure that all items in the Status column on the left are set to Enable (green). Use the Actions dropdown on the right to change options.
Ensure all caching on the server hosting your Magento installation are enabled.
If you have a Varnish cache – make sure it is enabled.
Ensure your cron settings for loaded and working.
A good clue that your cron is not running is a persistent index error message when logging in to the backend.
Here is a sample – your required cron may vary.
* * * * * /usr/bin/php /var/www/magento2/bin/magento cron:run | grep -v "Ran jobs by schedule" >> /var/www/magento2/var/log/magento.cron.log
* * * * * /usr/bin/php /var/www/magento2/update/cron.php >> /var/www/magento2/var/log/update.cron.log
* * * * * /usr/bin/php /var/www/magento2/bin/magento setup:cron:run >> /var/www/magento2/var/log/setup.cron.log