Reduce other I/O activity on the disks containing the redo logs, or use dedicated disks.
Alternate redo logs on different disks to minimize the effect of the archiver on the log writer.
Move the redo logs to faster disks or a faster I/O subsystem (for example, switch from RAID 5 to RAID 1).
Consider using raw devices (or simulated raw devices provided by disk vendors) to speed up the writes.
Depending on the type of application, it might be possible to batch COMMITs by committing every N rows, rather than every row, so that fewer log file syncs are needed.
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