(z/OS only) Large Page support provides improved performance by putting some or all index buffers in memory backed by large page frames. Memory in these pages is fixed and provides a faster access path.
Discovering what performance effects to expect from this feature, either positive or negative, can only come from experimenting at your specific site. Taking memory away from the 4 KB page memory to create 1 MB of "not-page" memory has benefits to the user of the memory and costs to all the other address spaces. Having any absolute benchmark is therefore not to be expected, and for that reason the wisest course to take when experimenting at your site is to start relatively small and watch for changes.
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