My MacBook gets tweaky when I use the iMac as a display... suggestions?

When hooking up my MacBook Pro to my iMac (to use the iMac as a display, via Thunderbolt) it causes my MacBook to be tweaky, slow, taking too long to think, and then keeps Photoshop all the way to the right when I disconnect the iMac... any suggestions? I love using the big screen as a monitor, but need the luxury of the lap top for work (we travel a lot, and I cannot exactly tote around a giant 27' iMac...). I use Photoshop CS5 and I'm usually running it at the same time as Mail and Google Plus, but that's usually it. I have my Time Machine hooked up to back me up in case anything happens, of course, but I want the speed of the laptop even if it's hooked up to the iMac!
Thank you!

Can the iMac work as a display the same as the Apple display?
Only if it's a 27-inch model. Other Macs require a VNC setup or ScreenRecycler, which will be much slower.
(55103)

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High performance on display.
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I am trying to install this software and the ./configure went smoothly but the "make" command is giving me several warnings and a few errors which I am not sure how to fix
this is the output of make
Makefile:847: warning: overriding commands for target `clean-bcheck'
Makefile:825: warning: ignoring old commands for target `clean-bcheck'
Makefile:852: warning: overriding commands for target `bcheck-am'
Makefile:830: warning: ignoring old commands for target `bcheck-am'
Makefile:869: warning: overriding commands for target `clean-bcheck'
Makefile:847: warning: ignoring old commands for target `clean-bcheck'
Makefile:874: warning: overriding commands for target `bcheck-am'
Makefile:852: warning: ignoring old commands for target `bcheck-am'
Makefile:906: warning: overriding commands for target `clean-bcheck'
Makefile:869: warning: ignoring old commands for target `clean-bcheck'
Makefile:911: warning: overriding commands for target `bcheck-am'
Makefile:874: warning: ignoring old commands for target `bcheck-am'
make all-recursive
make[1]: Entering directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1'
Makefile:847: warning: overriding commands for target `clean-bcheck'
Makefile:825: warning: ignoring old commands for target `clean-bcheck'
Makefile:852: warning: overriding commands for target `bcheck-am'
Makefile:830: warning: ignoring old commands for target `bcheck-am'
Makefile:869: warning: overriding commands for target `clean-bcheck'
Makefile:847: warning: ignoring old commands for target `clean-bcheck'
Makefile:874: warning: overriding commands for target `bcheck-am'
Makefile:852: warning: ignoring old commands for target `bcheck-am'
Makefile:906: warning: overriding commands for target `clean-bcheck'
Makefile:869: warning: ignoring old commands for target `clean-bcheck'
Makefile:911: warning: overriding commands for target `bcheck-am'
Makefile:874: warning: ignoring old commands for target `bcheck-am'
Making all in src
make[2]: Entering directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src'
Making all in pics
make[3]: Entering directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src/pics'
make[3]: Nothing to be done for `all'.
make[3]: Leaving directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src/pics'
make[3]: Entering directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src'
if g++ -DHAVE_CONFIG_H -I. -I. -I.. -I/src/pics -I/opt/kde/include -I/opt/qt/include -I. -DQT_THREAD_SUPPORT -D_REENTRANT -Wno-long-long -Wundef -ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wconversion -Wchar-subscripts -Wall -W -Wpointer-arith -O2 -Wformat-security -Wmissing-format-attribute -Wno-non-virtual-dtor -fno-exceptions -fno-check-new -fno-common -MT editaddmul.o -MD -MP -MF ".deps/editaddmul.Tpo" -c -o editaddmul.o editaddmul.cpp; \
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from _editaddmul.h:13,
from editaddmul.h:3,
from editaddmul.cpp:1:
/opt/qt/include/qstring.h: In member function 'char QChar::latin1() const':
/opt/qt/include/qstring.h:194: warning: conversion to 'char' from 'int' may alter its value
/opt/qt/include/qstring.h: In member function 'void QChar::setCell(uchar)':
/opt/qt/include/qstring.h:219: warning: conversion to 'ushort' from 'int' may alter its value
/opt/qt/include/qstring.h: In member function 'void QChar::setRow(uchar)':
/opt/qt/include/qstring.h:220: warning: conversion to 'ushort' from 'int' may alter its value
/opt/qt/include/qstring.h: In constructor 'QChar::QChar(uchar, uchar)':
/opt/qt/include/qstring.h:264: warning: conversion to 'ushort' from 'int' may alter its value
/opt/qt/include/qstring.h: In constructor 'QStringData::QStringData(QChar*, uint, uint)':
/opt/qt/include/qstring.h:362: warning: conversion to 'unsigned int:30' from 'uint' may alter its value
/opt/qt/include/qstring.h:362: warning: conversion to 'unsigned int:30' from 'uint' may alter its value
In file included from /opt/qt/include/qobject.h:45,
from /opt/qt/include/qwidget.h:43,
from /opt/qt/include/qdialog.h:42,
from _editaddmul.h:14,
from editaddmul.h:3,
from editaddmul.cpp:1:
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/opt/qt/include/qevent.h:520: warning: conversion to 'unsigned char' from 'uint' may alter its value
In file included from /opt/qt/include/qwidget.h:49,
from /opt/qt/include/qdialog.h:42,
from _editaddmul.h:14,
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from editaddmul.cpp:1:
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editaddmul.cpp:54: error: 'atof' was not declared in this scope
make[3]: *** [editaddmul.o] Error 1
make[3]: Leaving directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/link/Docs/Builds/Astro/skylendar-1.7.1'
make: *** [all] Error 2

I happened to see your question on linuxquestions, and they're probably right about gcc 4.3 being the problem. You should mail the author (off the app in question) and tell him to update the "include statements" to comply with gcc 4.3

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Welcome to the Apple Support Communities
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My MacBook gets tweaky when I use the iMac as a display... suggestions?

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