Faster DirectoryExists function?

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There is no faster way:

any function accessing anything on a remote share will timeout when that share is not available.

If the cause of your timeouts is automatic disconnecting of shares, then these link may help you:

If the application can continue without the completion of the check, then you can put the check in a separate thread, and upon completion of the check, you can update your status in the UI.

Be aware that when you try a multi-threading way, that you have to disprove your code is free of race-conditions and memory leaks. Time-outs in combination with exceptions usually make that a hard task.

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