I left my program open for 9 hours and it used up 700mb of ram, could someone review it?

[Gan via Digitalmars-d-learn]

On Tuesday, 27 January 2015 at 19:59:08 UTC, Gan wrote:
> On Tuesday, 27 January 2015 at 19:26:12 UTC, bearophile wrote:
>> Gan:
>>
>>> Is there some special stuff I gotta do extra with structs? Do 
>>> they need manually allocated and released?
>>
>> Most of your usages of tiny structs should be by value. So 
>> just keep in mind they are values. Even when you iterate with 
>> a foreach on a mutable array of them :-)
>>
>>
>>> On a second question, do I ever need to manually release 
>>> objects I create with new?
>>
>> Usually not. How much advanced do you want to be? :-)
>>
>> Bye,
>> bearophile
>
> Thanks. I'll give structs a try.
>
> When I start the program, it runs fine at 35mb of ram. It only 
> keeps 15 objects stored in the arrays at a time so why do you 
> think my ram usage increases to 700+ after many hours?

Curiously, my CPU usage went from 10% to 5% after I changed to 
structs on Point and Range. Though my memory still climbs high.