SANTA CLARA — As great as the 49ers have played behind quarterback Colin Kaepernick, they're not so great at always getting plays off in a timelier fashion.

"That's an area we can improve," 49ers coach Jim Harbaugh said Monday, a day after opening the season with a 34-28 win over the Green Bay Packers.

The 49ers' play-clock issues have carried over from last season in a variety of ways. The fallout Sunday: timeouts were burned, a delay-of-game penalty got called and, perhaps by extension, center Jonathan Goodwin had two false-start penalties.

Harbaugh suggested that the 49ers' extensive playbook was the genesis of their clock issues.

"There's a high volume of plays," Harbaugh said. "Sometimes there's a give and take there. There's so much volume there that a few times guys came out of the huddle and didn't know where to line up. That bled some seconds off the clock and we had to take a timeout."

Unwilling to say how many plays he relays into Kaepernick before each snap, Harbaugh did note that some calls are sent in with an abbreviated code.

Communication issues could remain a concern this week when the 49ers travel to Seattle's ever-loud stadium for a Sunday night game.

To help their clock management, the 49ers installed a scoreboard with a clock on their practice field in training camp.

For more on the 49ers, see Cam Inman's Hot Read blog at blogs.mercurynews.com/49ers. Follow him on Twitter at twitter.com/CamInman.