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VPS memory allocation DreamHost Wordpress

A new client of mine in November switched to VPS. They are using DreamHost as the provider. The code is generated in Wordpress with plugins.  Since moving to VPS they have been getting memory allocation errors and the server keeps rebooting.  Before I was brought in they kept increasing the amount of memory allocated as suggested by DreamHost.  This has not resolved the issue.  

The other issue is the back-up had not worked since the VPS switch. They are using the backupbuddy plugin.  

I was going to start by checking to see if all the plugins are being used. Is there a tool that can do that? Is there a better way to got about fixing the memory issue?

Thanks.
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DreamHost set up the the server and did all the compiling.  My client is using wordpress to get the static pages and plugins moved to the server.
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My understanding is there were problems in the shared environment and they were told if the site was moved to VPS the problems would end.  Instead of that fixing the problem more became created.  

My expertise is in .net world.  So this is new to me. The person who owns the site has no experience at all.

The site has 45 plugins.  I am not sure if using so many could be an issue.  

When I run analytics the server response time is slow. I don't know if this could cause spiking.

If the site would work I have no problem advising it to be moved to an environment that is easy for a non programmer to update content.
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I contacted DreamHost to see about DreamPress.

Here is the list of plugins.  I am slowly going through them to see if any can be removed.  This unfortunately is not my expertise.

Akismet
BackupBuddy
Bad Behavior
BuddyPress
BuddyPress Group Email Subscription
Captcha
CCGallery WP
Contact Form 7
Cron GUI
FooBox HTML & Media Lightbox
Google Analytics for WordPress
Gravity Forms
Gravity Forms Constant Contact Add-On
Gravity Forms MailChimp Add-On
Gravity Forms Quiz Add-On
Gravity Forms Survey Add-On
Insert Headers and Footers
List category posts
Maintenance
MATRIX PRO
Membership Premium
Page Links To
Platinum SEO Pack
Popover plugin
Recent Posts Slider
Recipe Card
Redirection
Regenerate Thumbnails
RSS Multi Importer
SLIDER PRO
sliderpro 3D
Special Recent Posts FREE Edition
Special Recent Posts PRO Edition
superpro RESPONSIVE SLIDER
Testimonials by Aihrus
The Events Calendar
The Events Calendar: WooCommerce Tickets
The Events Calendar PRO
U BuddyPress Forum Attachment
ULTIMATE PRO
Ultimate Video carousel
ULTIMATE VIDEO GALLERY
WooCommerce
WordPress HTTPS
WordPress Related Posts
Wordpress Video Gallery
WP Google Maps
WP Google Maps - Pro Add-on
WPP Premium Functionality
WP Simple Survey – Extended
WP Super Cache
XML Sitemap & Google News Feeds
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ULTIMATE PRO says: Create easily a gallery of videos for your site with youtube and flv videos. Extremely quickly to use, add the url of your videos.

http://www.pluginswp.com/ultimate-full-video-gallery/
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I thank all the contributions. I am going to speak to the client and see what can be safely removed and consider moving the website to the DreamPress environment. If I have other issues I will open a new ticket.
You need to tune Apache in VPS, namely convert apache-prefork to apache-worker...
@gheist - be careful about blindly making that recommendation. If he's using mod_php (many people are, especially people who are in VPS scenarios because they're likely not very experienced in admin stuff yet), prefork is a better, more reliable choice, even if it's heavier.

mod_php isn't thread-safe.
Yes, it is about asking how to proceed. mod_fcgid and php-cgi comes as an answer