Hello and welcome to WCG. You will find the people here very helpful and willing to help whenver they can. I'm sure you'll soon make new friends here.

By default, 1GB is the size of drive space that WCG selects. To make this different...

Log onto WCG
Select Device Manager
Select Device Profiles
(you will see the default setting listed)
Click Create A New Device Profile
Give it a name
Select the amount of Hard Drive space you want to allocate
Change the days, times and projects if necessary
Click save

When done, click Device Manager again
Click on the name of your device
Change Current Assigned Device Profile
Click save
Repeat this part of the process for any other machines you wish to change

Your new settings will then kick into action AFTER the WU you are doing has completed and a new WU has been downloaded. So be patient and wait until then...

changing that number probably will not make your WCG run faster. the processor speed is what counts.

that number is just something that gives permission to use that much memory if WCG ever needs it (i think!)

Agreed. It's more cosmetic than essential. The biggest impact it will have is giving you more points per completed WU. (hece 'cosmetic' because points are worthless to the cause and don't really mean anything anyway.

Processor speed and memory are important in their own ways. The important thing is to have at least the minimum requirement for the particular type of project.
Whether it takes a few hours or a few days will still complete the result, and any result towards the final objective is worthwhile in the greater scheme of things...

mmm. confusing 'memory' with 'available disc space' could confuse some users.
My understanding is that this setting is purely for allocating a set size for the maximum amount of data space that the agent will be allowed on your machine. I don't think it refers to virtual memory settings, because your pagefile need not neccessarily be on the same drive that your WCG agent is installed.
In these days of machines with hundreds of spare GBs and an agent that at present uses so few, this setting is probably the least important. It will affect the minority who have little freedom in disc space and wish to limit the amount of daya that WCG will take.

I guess you could say that by restricting this setting, you could make the program less intrusive, but that you run the risk of excluding your machine from running any larger projects that may ocur in the future..