Suggestion to improve performance

We found an excessive loading of data from the database when generating the main page of a journal issue
OJS 3.3.0-14

$sections = Application::get()->getSectionDao()->getByIssueId($issue->getId());

In addition to information about sections, data about articles is loaded here, which is not required for this page.
We have replaced this line

$sections = [];
foreach ($issueSubmissions as $vis) {
if(!array_key_exists($secid, $sections))
$sections[$secid] = Application::get()->getSectionDao()->getById($secid);

In our case, we managed to get an increase in speed by 1.5 - 2 times

hello @vodingithub !

See this issue: OJS is very slow with a large table of contents (hundreds of items) · Issue #6511 · pkp/pkp-lib · GitHub