Hi We're on Debian GNU/Linux 8 running Koha 16.11.04. Today the library complained that Koha was acting very slow - a search in the OPAC takes about 10 to 30 seconds. With command "top" the following can be seen: top - 13:06:31 up 2:44, 3 users, load average: 3.14, 2.54, 2.41 Tasks: 162 total, 5 running, 157 sleeping, 0 stopped, 0 zombie %Cpu0 : 95.7 us, 4.3 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st %Cpu1 : 95.7 us, 4.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.3 si, 0.0 st KiB Mem: 4049620 total, 2377480 used, 1672140 free, 218872 buffers KiB Swap: 4189180 total, 6632 used, 4182548 free. 813584 cached Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 19678 phsh-ko+ 20 0 224672 83616 8996 R 43.2 2.1 0:01.59 opac-searc+ 19672 phsh-ko+ 20 0 393696 148372 12304 R 41.2 3.7 0:03.09 opac-searc+ 19682 phsh-ko+ 20 0 211028 69912 8860 R 28.9 1.7 0:00.87 opac-searc+ 19684 phsh-ko+ 20 0 168824 42320 8496 R 14.3 1.0 0:00.43 opac-searc+ ... Most of the time, "opac-search.pl" is eating up 95-100% of the CPU and more than one process can be seen at the same time. Eventually I found many lines like the following in the file "opac-error.log": [Wed May 03 13:13:10.796794 2017] [cgi:error] [pid 20053] [client 66.249.64.32:39077] AH01215: [Wed May 3 13:13:10 2017] opac-detail.pl: Use of uninitialized value in subroutine entry at /usr/share/perl5/URI/Escape.pm line 184. [Wed May 03 13:13:17.600461 2017] [cgi:error] [pid 20479] [client 66.249.64.32:50544] AH01215: [Wed May 3 13:13:17 2017] opac-ISBDdetail.pl: Use of uninitialized value in subroutine entry at /usr/share/perl5/URI/Escape.pm line 184. When I searched for who is 66.249.64.32 I saw this IP addresse belongs to Google. When I added some functionality to show the execution time of "opac-search.pl" I got many more lines like the following, all of them indicating to IP address 66.249.64.32: [Wed May 03 13:10:01.030216 2017] [cgi:error] [pid 20053] [client 66.249.64.32:39077] AH01215: START: 1493809799.15058 / END: 1493809801.02982 = 1.87923502922058 [Wed May 03 13:10:04.426503 2017] [cgi:error] [pid 20147] [client 104.154.58.95:33362] AH01215: START: 1493809799.83011 / END: 1493809804.42624 = 4.59613108634949 [Wed May 03 13:10:06.473646 2017] [cgi:error] [pid 20053] [client 66.249.64.32:39077] AH01215: START: 1493809805.1977 / END: 1493809806.47357 = 1.27586483955383 I'm not sure what this means. Is this Google indexing our library catalog and thus slowing everything down? Do you have experienced similar behaviour or can someone please explain what's happening? Best wishes: Michael