Comment 2 for bug 784978

That is a good one. It looks like it is possible to estimate how much memory will be <a href="http://www.charles-reace.com/blog/2009/11/18/memory-usage-in-php-gd-image-functions/">required</a> for GD functions, in which case, the decision about resize can be made based on the particular system performance (rather than keeping it fixed). Also there are some suggestions to use gc_collect_cycles() after GD calls to free system memory that GP keeps after use.