Opencart slow (mayabe for nitropack module installed)

Hello, i need someone that help me to understand because my website is become slow, maybe is Nitropack issue because in hosting log there are this problems: mod_fcgid: stderr: PHP Warning: mysqli::mysqli(): (HY000/1203): User uo0hs500_ocdb23 already has more than 'max_user_connections' active connections in /home/uo0hs500/domains/[login to view URL] on line 7, referer: [login to view URL] [Wed Sep 23 12:53:01.145885 2015] [fcgid:warn] [pid 31616:tid 140200346855168] [client [login to view URL]] mod_fcgid: stderr: PHP Notice: Error: Could not make a database link (1203) User uo0hs500_ocdb23 already has more than 'max_user_connections' active connections in /home/uo0hs500/domains/[login to view URL] on line 10, referer: [login to view URL] [Wed Sep 23 12:53:01.145901 2015] [fcgid:warn] [pid 31616:tid 140200346855168] [client [login to view URL]] mod_fcgid: stderr: PHP Warning: mysqli::close(): Couldn't fetch mysqli in /home/uo0hs500/domains/[login to view URL] on line 58, referer: [login to view URL] [13:16:38] Marco Riccardi: [Wed Sep 23 10:50:00.291688 2015] [fcgid:warn] [pid 31616:tid 140200053139200] [client [login to view URL]] mod_fcgid: stderr: PHP Notice: Error: Could not make a database link (1203) User uo0hs500_ocdb23 already has more than 'max_user_connections' active connections in /home/uo0hs500/domains/[login to view URL] on line 10, referer: [login to view URL]