ELA - Performance problem when brows alert page / tag

ELA - Performance problem when brows alert page / tag

For these few days, our ELA performance is so slow when view the page of alert tag, always waiting more 10mins to complete to load the page.
Is there any ways to check why it was so slow when brows the alert page, as we have some groups alert message want to review on everyday.
Also please see the JVM information as below, any need to improve?

JVM Memory Information
Total JVM Heap Size     1841 MB
Used JVM Heap Size     1074 MB
Free JVM Heap Size     767 MB
Max Memory For JVM     1841 MB
Processors available to JVM     4 
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