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Here is a link that describes, in detail, the main differences between NOR and NAND flash. NOR flash is slow to write by design, as it was intended for low-density, high-speed read applications...
Flash memory was developed from EEPROM (electrically erasable programmable read-only memory) and must be erased in fairly large blocks before these can be rewritten with new data. The high density NAND type must also be programmed and read in (smaller) blocks, or pages, while the NOR type allows a single machine word (byte) to be written or read independently.
Therefore: the NOR type is slow because it allows true random access.
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