Webmail slow after login - php settings perhaps?

Hello, I just started having an issue this morning with slow webmail after logging in. The login is very quick and the user is taken to the "select webmail client" screen very quickly but after selecting either horde or roundcube it is very slow to load up the webmail interface in general, not including the mail showing in the interface. I am wondering if there are some resource limitations on the webmail/cpanel processes which can be increased because it does not appear I am running low on resources. I'll also add that there are no websites (besides webmail) running on this server, it is only used for email. There doesn't appear to be a 'huge' number of users logged in: [root@mail ~]# doveadm who| wc -l username # proto (pids) (ips) 21
I believe doveadm who should also show webmail logins but this is an assumption based on the fact that webmail uses imap connections. The load looks fine: [root@mail]# w 10:57:13 up 41 days, 22:25, 5 users, load average: 0.97, 0.91, 0.93
Memory usage seems acceptable: [root@mail ~]# free -mh total used free shared buff/cache available Mem: 31G 2.7G 267M 1.5G 28G 26G Swap: 15G 86M 15G
The hardware should be adequate this is the specs: 2x Intel Xeon CPU E5-2630 v4 @ 2.20GHz Crucial 32GB Kit (4 x 8GB) DDR4-2400 RDIMM 2400 MHz 6x Intel SSD DC S3520 Series (1.6TB, 2.5in SATA 6Gb/s) in a raid 10 Raid 10 is configured using a LSI 9300 MegaRAID SAS 9361-8i (LSI00417) Are there any memory settings that I could perhaps increase or any other possible limitations?