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I'm not saying timing attacks against interpreted code are impossible. I'm just saying they are easier to execute against native code, and thus have nothing to do with JS crypto being less secure than native crypto.

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no serious person writes native code that vulnerable to timing attacks. if native crypto code has a measurable difference in execution time for different code paths that usually results in huge security advisories, patches, and it's against openssl a published paper. if the native code is written with constant time taken for all execution paths then by definition a timing attack is not possible. even if they are very close in execution time the timing attack is much more difficult, if not impossible.

timing attacks are only easier against native code written by people who don't know what they're doing, which means they made different execution paths take variable amounts of time, didn't examine the generated assembly by a hardware expert, and didn't bother to mask the crypto operations with proper noise generated using a cryptographically secure prng.

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