Deprecated - Performance and scalability

Drupal 5.0
Configuration file Protected
Cron maintenance tasks Last run 42 sec ago
You can run cron manually.
Database schema Up to date
File system Writable (public download method)
GD library bundled (2.0.28 compatible)
MySQL database 5.0.24
PHP 5.1.5
Unicode library PHP Mbstring Extension
Web server Apache/2.2.3 (Win32) PHP/5.1.6

When i enable cache i was always having problems, before It just use to get page can not be displayed (only when i log off and click on a link a second time. ) so i disabled it till i got the other modules working, And now its about that time... sessions-singlesignon- and multidomains seem to be working when cache is disabled but now instead of getting the error message "page can not be displayed" I get the following scripting error

Error:

Notice: Undefined index: HTTPS in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\allensworld\modules\addmodules\multidomain\multidomain.module on line 277

Notice: Undefined index: http://www.allensworld.org in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\allensworld\modules\addmodules\multidomain\multidomain.module on line 278

Notice: Undefined index: HTTPS in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\allensworld\modules\addmodules\multidomain\multidomain.module on line 301

I've been playing with Drupal fo a couple of weeks and I like the features that are available but I have some issues with the speed.

A regular php page with some sql queries takes about 0.3 seconds to run but a simple Drupal page with a basically empty database runs in 1.6 to 3 seconds. Is this what I should expect?

I've seen that Drupal is used by some large sites, so I assume that tuned properly it works well.

The company that hosts my account can't find the problem nor recreate it so to them everything seems fine. But ..., my admin logs are littered with error messages like:

- lost connection to MySQL server
- unable to save set in ....
- Server shutdown in progress query

The servers run:
- php 4.4.3
- MySQL 4.1.21-standard

Can anyone help me solve this problem?

Here are the more descriptive error messages:

My JavaScript knowledge is terrible, so I'm struggling to diagnose this very far, but it seems to me that drupal.js adds significant browser processing time on long pages. Clearly, there are two solutions: (1) sort drupal.js and (2) shorten my pages!

Anecdotally, my firefox browser takes around 45 seconds to load and render a particular page (on a LAN connected server) with drupal.js, and about 20 without (ie. time from clicking refresh to the end of "mouse swoosh" animation).

I'm exploring the idea of moving the cache table to its own database on separate server hardware. I'm wondering if anyone has tried this with 4.7 or if there's a good discussion on the topic.

More background --

One of my sites is with a hosting provider that limits the database size at 100MB, but they'll let you setup just about as many databases as you'd like (and most of the time, they end up on different servers). I expect the space limitation could become an issue for me 6 to 12 months from now.

My problem:
I've now spent many days trying to fix an image upload problem. I have searched high and low, so now it is time to post. I hope I chose the right forum.

I have image and img_assist modules installed. All modules loaded are listed below.

While trying to upload a 2.2 MB image, I get these errors from a couple of computers:

* Fatal error: Allowed memory size of 25165824 bytes exhausted (tried to allocate 14208 bytes) in /home/suzan24k/www/includes/image.inc on line 288

increased php memory from 24 MB to 32 MB and got this next message.

* Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 10368 bytes) in /home/suzan24k/www/includes/image.inc on line 288

I have deleted almost all unused modules I had. I can upload images up to 1 MB successfully from computers having slower upload speeds. Not sure if slower upload speeds cause my image upload problem but it is the only common denominator I can see.

I have a PHP file upload max size of 20 MB.

Here are some test runs:

1. I am have been able to upload large image files up to 4MB from my desktop which is connected via wired cable to my cable internet service.
2. My father’s desktop computer which is also wired (in his home in another city) using DSL internet cannot upload photo images larger than about 1MB.
3. My wireless laptop at home with desktop in #1 fails trying to upload a 2.2 MB file.