I haven't found Freenet latency to be bad for most keys these days. For example, I mirror my blog in Freenet and it's on the order of seconds rather than minutes. Even an image gallery I tried has reasonable response. Uploading data on the other hand is very slow.
Here's my blog key if you want to try:
USK@1ORdIvjL2H1bZblJcP8hu2LjjKtVB-rVzp8mLty~5N4,8hL85otZBbq0geDsSKkBK4sKESL2SrNVecFZz9NxGVQ,AQACAAE/bluishcoder/3/
And the image gallery: USK@2LK9z-pdZ9kWQfw~GfF-CXKC7yWQxeKvNf9kAXOumU4,1eA8o~L~-mIo9Hk7ZK9B53UKY5Vuki6p4I4lqMQPxyw,AQACAAE/pitcairnisland/0/