You can't prevent forced font calculation, anyway that should occur only ones at first startup. On dumb phones (with ahead-of-time compilator as in sony ericsson devices) calculation run 10-20 seconds until operation is finished (c510 is the champ). On s60 takes up to 50s with .sis app and something like 1% per minute with java version so I can only guess that Opera Mini doesn't run near to native code on all devices.
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Other phones