The answer
Some post-quantum schemes have larger signatures or different memory and computation requirements. The impact depends on algorithm, hardware and protocol design rather than a universal slowdown.
What to do next
Look for measured signing time, memory usage and transaction-byte benchmarks on the actual device.
NIST Post-Quantum Cryptography resources
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Trezor hardware wallet
A current-generation hardware wallet for managing keys; it does not make Bitcoin or Ethereum quantum-resistant or resolve a future protocol migration.
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