meaning what? they don't come often enough, they don't crawl deep enough, etc? I've not experienced any problems.
Hey JA... how's it goin? More info if ya would... are you talking bot visits? indexing? cache update? data push? Many options there...
Google doesn't crawl slow in my experience, if you have any issue go with sitemap and set your own crawling speed. In addition to this if your site is new it will take time to appear properly and get indexed.