Mine record well enough (90% solid - a gut guess - using SD Event recording versus Continuous.)
Accessing card content, performance drops to at worst 75% (gut guess) and seems attributable to possible simultaneous-job-workload the processor may be under, and/or network timing issues (timeout?), and/or hell if I know.
Tangentially, omission of SD access from tinyCam Pro’s feature set suggests something, maybe…
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In addition, I get the impression there may be some truth to this:
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(…gut guess, seems, possible, may be, hell-if-i-know, suggests, maybe, impression, may be, some… qualify much? 
)