php disk wait, web server response horrible

About Version 0.12.3, the latest version).
The place where it’s used for this web server:

https://www.wwals.net/events-2/outings-events/

[gdoc key=”https://docs.google.com/spreadsheets/d/1mPus_CfxZL59vHN0FW1bDROi3OQ6YJCkuboPxBp7hi4/edit?usp=sharing” datatables_order=’%5B%5B 0, “desc” %5D%5D’]

For several weeks, our web server was increasingly slow,
until it became unusable, as in so slow it would fail on database
connection before publishing a blog post, and often when only
retrieving a page.

Many php processes were hung on disk wait.

Load average ranged from 35 to 100.

Restarting httpd or mysqld or rebooting the (virtual) server
made no difference.

I deactivated Inline Google Spreadsheet Viewer.
Instantly load average dropped to 1, no phps hung on disk wait,
and web service returned to snappy.

The time period in which the problem occurred also corresponds
to the month or so between the previous and current versions of
the plugin.

Anybody else see this problem?

Any fix to the plugin?

I really like the plugin.
But I can’t use it if it makes everything else unusable.